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SM8701BM
NIPPON PRECISION CIRCUITS INC.
DVD Player Clock Generator
OVERVIEW
The SM8701BM is a 27 MHz master clock, 5-system output clock generator for DVD players. It has 2 built-in PLLs that, with the addition of a single crystal oscillator element, can generate 256fs, 384fs and 768fs clocks plus independent fixed-frequency 27 MHz and 33.8688 MHz output clocks. Supported sampling frequencies (fs) include the standard 32, 44.1 or 48 kHz, or double-frequency 64, 88.2 or 96 kHz.
FEATURES
s
PINOUT
(Top View)
s
s
s s s
s
27 MHz master clock (internal PLL reference clock) Generated clocks * 27 MHz output * 33.8688 MHz output * 256fs output * 384fs output * 768fs output Sampling frequency fs * 32/64 kHz * 44.1/88.2 kHz * 48/96 kHz Low jitter output 3-wire serial or parallel control Supply voltage: VDD = VDDP = 5.0V VDDO = VDD3 = 3.3V 20-pin SSOP package
MLEN/R2 P/S VDD GND XTO XTI GNDP VDDP VDD3 MO
1
20
10
11
MCK/R1 MDT/R0 RSTN SO3 VDDO GNDO SO2 SO4 SO1 MON
SM8 7 0 1B
APPLICATIONS
s
PACKAGE DIMENSIONS
(Unit: mm)
DVD players
ORDERING INFORMATION
D e vice SM8701BM P ackag e 20-pin SSOP
5.30 0.05 7.90 0.20 1.30 0.10 0.62TYP 7.40MAX 7.20 0.05
0.20 0.05
2.10MAX
1.80 0.10 0.10 0.10
0 to 8 0.65 0.68 0.12 0.10 0.30 0.10
0.13 M
NIPPON PRECISION CIRCUITS--1
0.6 0.15
SM8701BM
BLOCK DIAGRAM
Divider0 XTI Oscillator XTO
Phase Comparator0
Charge Pump0
LPF0
VCO0
SO4
Divider0 P/S MLEN/R2 MDT/R0 MCK/R1 Divider1
Phase Comparator1
SO3 Divider SO2
External Interface SO1 Charge Pump1 LPF1 VCO1
Divider1
MO MON
RSTN
Reset Circuits
NIPPON PRECISION CIRCUITS--2
SM8701BM
PIN DESCRIPTION
Number 1 Name MLEN/R2 I/O Ip 1 Control signal input. In serial mode: latch enable signal In parallel mode: sampling rate select signal Mode select signal. L O W : serial mode, HIGH: parallel mode 5 V supply (Digital block) Ground (Digital block) Reference signal crystal oscillator element connection Reference signal crystal oscillator element connection or external clock input Ground (PLL block) 5 V supply (PLL block) 3.3 V supply (output buffer) 27 MHz fixed-frequency output 27 MHz fixed-frequency output (inverted) 33.8688 MHz fixed-frequency output 768fs output 256fs output Ground (output buffer) 3.3 V supply (output buffer) 384fs output L O W -level reset input Control signal input. In serial mode: control data input signal In parallel mode: sampling frequency select signal Control signal input. In serial mode: clock signal In parallel mode: sampling frequency select signal Description
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
P/S VDD GND X TO XTI GNDP VDDP VDD3 MO MON SO1 SO4 SO2 GNDO VDDO SO3 RSTN MDT/R0
Ip 1 - - O I - - - O O O O O - - O Ip 2 Ip 1
20
MCK/R1
Ip 1
1. Schmitt trigger input with pull-down resistor 2. Schmitt trigger input with pull-up resistor
NIPPON PRECISION CIRCUITS--3
SM8701BM
SPECIFICATIONS
Absolute Maximum Ratings
P arameter Supply voltage range Symbol V DD , V DDP , V DDO , V DD3 VDD - VDDP , VDDO - VDD3 , G N D - G N D P, GND - G N D O, GNDP - G N D O V IN VOUT PD T stg Digital inputs Digital outputs Condition Rating -0.3 to 6.5 Unit V
Supply voltage deviation
0.1
V
Input voltage range Output voltage range Pow er dissipation Storage temperature range
-0.3 to V D D + 0.3 -0.3 to V D D O , V D D 3 + 0.3 300 -55 to 125
V V mW C
Recommended Operating Conditions
P arameter Supply voltage ranges Operating temperature range Symbol V DDO , V DD3 V DD , V D D P T opr Condition Rating 2.7 to 3.6 4.5 to 5.5 -40 to 85 Unit V V C
NIPPON PRECISION CIRCUITS--4
SM8701BM
DC Electrical Characteristics
External clock, Ta = -40 to 85 C, VDD = VDDP = 4.5 to 5.5 V, VDDO = VDD3 = 2.7 to 3.6 V unless otherwise stated
Rating P arameter Symbol Condition min All supplies. V D D = V D D P = 5.0V, V D D O = V D D 3 = 3.3 V, T a = 25 C , fs = 48 kHz, using XTI external 27 M H z master clock, no load on clock outputs (MO, M O N , SO1 to SO4) P/S, MLEN/R2, MCK/R1, MDT/R0, RSTN P/S, MLEN/R2, MCK/R1, MDT/R0, RSTN XTI XTI V IN = V D D V IN = 0 V V IN = V D D V IN = 0 V XTI, V IN = V D D XTI, V IN = 0 V All outputs. IO H = -2 m A All outputs. IO L = 4 mA typ max Unit
Current consumption
ID D
-
32
45
mA
HIGH-level input voltage L O W -level input voltage HIGH-level input voltage L O W -level input voltage HIGH-level input L O W -level input HIGH-level input L O W -level input current 1 current 1 current 2 current 2
V IH1 V IL1 V IH2 V IL2 IIH1 IIL1 IIH2 IIL2 IIH3 IIL3 VOH VOL
2.0 - 0.7 x V D D - - - - - - - V D D O - 0.4 -
- - - - - - - - - - - -
- 0.8 - 0.3 x V D D 150 -1 1 -150 40 -40 - 0.4
V V V V A A A A A A V V
HIGH-level input current L O W -level input current HIGH-level output voltage L O W -level output voltage
1. P/S, MLEN/R2, MCK/R1, MDT/R0. Schmitt trigger input, internal pull-down. 2. R S T N . Schmitt trigger input, internal pull-up.
NIPPON PRECISION CIRCUITS--5
SM8701BM
PLL AC Electrical Characteristics
External clock, Ta = -40 to 85 C, VDD = VDDP = 4.5 to 5.5 V, VDDO = VDD3 = 2.7 to 3.6 V unless otherwise stated
Rating P arameter XTI external input clock frequency Output clock rise time Output clock fall time M O , M O N output clock jitter1 SO1, SO2 (Standard), SO3, SO4 output clock jitter1 SO2 (Double) output clock jitter1 M O , M O N output clock duty 1 SO1, SO2 (Standard), SO3, SO4 output clock duty 1 SO2 (Double) output clock duty 1 Settling time Pow er-up time 2 R S T N external reset LOW -level pulsewidth tS tP tR S T L DUTY Cr ystal oscillator element, C L = 20 p F C L = 20 p F C L = 20 p F All outputs All outputs 1.4 V to 1.4 V JITTER Standard tolerance Cr ystal oscillator element Symbol fM tR tF Condition min D U T Y: 50 5% All outputs, 0.2 to 0.8V D D O or V D D 3 , C L = 20 p F All outputs, 0.8 to 0.2V D D O or V D D 3 , C L = 20 p F - - - - - - 45 40 23.3 - - 100 typ 27.0000 2.5 2.5 150 150 450 50 50 33.3 - - - max - - - - - - 55 60 43.3 40 50 - MHz ns ns ps ps ps % % % ms ms ns Unit
1. 1.4V to 1.4V. Ta = 2 0 C . The characteristics of output clock jitter and output clock duty depends on crystal oscillator. N P C 's standard crystal oscillator: R = 10.5 , L = 5.38 mH, Ca = 6.74 fF, Cb = 1.85 p F measurement apparatus: HP4195 Load capacitance: C1 = 7 p F, C2 = 11 p F
Cb
L
Ca
R
2. Time from OFF condition to stable frequency output.
NIPPON PRECISION CIRCUITS--6
SM8701BM
Serial Interface AC Characteristics
External clock, Ta = -40 to 85 C, VDD = VDDP = 4.5 to 5.5 V, VDDO = VDD3 = 2.7 to 3.6 V unless otherwise stated
Rating P arameter MCK HIGH-level pulsewidth M C K L O W -level pulsewidth MCK pulse cycle time MDT setup time MDT hold time MLEN setup MLEN hold time 1 Symbol tM C W H tM C W L tM C Y tM D S tM D H tM L S tM L H tM H H tM L L Condition min 40 40 100 40 40 40 40 200 16 x tM C Y typ - - - - - - - - - max - - - - - - - - - ns ns ns ns ns ns ns ns ns Unit
time 2
MLEN HIGH-level pulsewidth M L E N L OW -level pulsewidth
1. Time from the MLEN falling edge to the next MCK rising edge. If the MCK clock stops after the LSB, the MLEN rise timing is optional. 2. Time from MCK rising edge corresponding to the LSB to the MLEN rising edge.
tMCWH tMCWL
MCK
tMLH
tMLS
1.4V
tMCY
MDT
MSB LSB 1.4V
tMLS
MLEN
tMDS
tMDH tMLL
tMHH
1.4V
NIPPON PRECISION CIRCUITS--7
SM8701BM
FUNCTIONAL DESCRIPTION
27 MHz Master Clock
The 27 MHz master clock is generated either by connecting a crystal oscillator element between XTI (pin 6) and XTO (pin 5), as shown in figure 1, or by connecting an external 27 MHz clock to XTI, as shown in figure 2. Input 27MHz master clock on XTI when using an external clock. Crystal oscillator element must be fundamental.
C2
XTO (Pin5) Oscillator Internal Circuits
C1 C1, C2 = 5 to 33pF
XTI (Pin6) MO (Pin10) MON (Pin11) SM8701BM
Figure 1. Crystal oscillator connection
Open
XTO (Pin5) Oscillator Internal Circuits
External Clock
XTI (Pin6) MO (Pin10) MON (Pin11) SM8701BM
Figure 2. External clock input
NIPPON PRECISION CIRCUITS--8
SM8701BM
Sampling Frequency and Output Clock Frequency
The SM8701BM generates several output clocks from the 27 MHz master clock, with frequencies of 256fs (SO2), 384fs (SO3) and 768fs (SO4), where fs is the sampling frequency selected by external conTable 1. Sampling frequency and output clock frequency
Sampling rate Sampling frequency fs 32 kHz Standard 44.1 kHz 48 kHz 64 kHz D o u ble 88.2 kHz 96 kHz Output clock frequency (MHz) SO1 33.8688 33.8688 33.8688 33.8688 33.8688 33.8688 SO2 8.192 11.2896 12.288 16.384 22.5792 24.576 SO3 12.288 16.9344 18.432 24.576 33.8688 36.864 SO4 24.576 33.8688 36.864 24.576 33.8688 36.864
trol inputs. SO1 outputs 33.8688 MHz clock. The supported sampling frequencies and the output clock frequencies are shown in table 1.
Reset
The SM8701BM supports an external reset using RSTN (pin 18). At reset, the mode register takes its default value, and the output clocks have default frequencies. When RSTN goes HIGH, an internal reset continues for a period of 1024 cycles of the 27 MHz master clock. The timing is shown in figure 3.
RSTN
Reset
Internal Reset
1
2
3
1024
Master Clock
1024 Master Clock
Figure 3. External reset timing
NIPPON PRECISION CIRCUITS--9
SM8701BM
Operation Control
The SM8701BM functions are controlled by inputs MLEN/R2 (pin 1), MDT/R0 (pin 19) and MCK/R1 (pin 20). The operating mode is selected by input P/S (pin 2)--serial control when P/S is LOW, and parallel control when P/S is HIGH. Table 2 shows the relationship between functions and mode.
Table 2. Control functions
Controllable Function Serial Sampling frequency group: 48/44.1/32 kHz Sampling rate: standard/double Clock output: enable/disable Yes Yes Yes P arallel Yes Yes No
Serial control (P/S = LOW) When P/S is LOW, the control interface is serial control mode. The serial control data is set by 16-bit MDT data in sync with the MCK clock and the MLEN enable signal clock at the serial control mode. The format is shown in figure 4.
MCK
MDT
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MLEN
Figure 4. Serial control format The 16-bit mode register (MREG) is shown in figure 5, and the name and function of each bit is described in tables 3 to 5. In serial control mode, mode register bits D15 to D10 must be set to 011100. D3 is fixed as LOW.
MREG
0 D15
1 D14
1 D13
1 D12
0 D11
0 D10
CE6 D9
CE5 D8
CE4 D7
CE3 D6
CE2 D5
CE1 D4
RSV D3
R2 D2
R1 D1
R0 D0
Note: RSV is fixed as LOW .
Figure 5. Mode register
Table 3. Mode register control bit functions
Bit D9 D8 D7 D6 D5 D4 D3 D2/D1/D0 Name CE6 CE5 CE4 CE3 CE2 CE1 RSV R2/R1/R0 Function M O N output enable/disable MO output enable/disable SO4 output enable/disable SO3 output enable/disable SO2 output enable/disable SO1 output enable/disable Fixed as LOW Sampling frequency select
Table 4. CE6 to CE1 clock output control setting
CE6 to CE1 LOW HIGH Clock output Disable (LOW -level output) E n a ble (default)
NIPPON PRECISION CIRCUITS--10
SM8701BM
Table 5. Sampling frequency select (R2, R1, R0)
R2 LOW LOW LOW LOW HIGH HIGH HIGH HIGH R1 LOW LOW HIGH HIGH LOW LOW HIGH HIGH R0 LOW HIGH LOW HIGH LOW HIGH LOW HIGH D o u ble D o u ble D o u ble Sampling rate Standard Standard Standard Sampling frequency gro u p 48 kHz 44.1 kHz 32 kHz Prohibited (test mode) 48 kHz 44.1 kHz 32 kHz Prohibited (test mode) 96 kHz 88.2 kHz 64 kHz Sampling frequency 48 kHz (default) 44.1 kHz 32 kHz
When the sampling frequency is changed, a settling time of 40 ms (max) is required to make the output frequency stable. The SO2 to SO4 output response
when the frequency is changed is shown in figure 6. SO1 fixed on 33.8688 MHz.
MLEN
tS
SO2 to 4
Clock Transition Region
SO1
33.8688MHz
Figure 6. System clock transient timing
NIPPON PRECISION CIRCUITS--11
SM8701BM Parallel control (P/S = HIGH) When P/S is HIGH, the control interface is parallel control mode. The parallel control pins R2 (pin 1),
Table 6. Sampling frequency select (R2, R1, R0)
R2 LOW LOW LOW LOW HIGH HIGH HIGH HIGH R1 LOW LOW HIGH HIGH LOW LOW HIGH HIGH R0 LOW HIGH LOW HIGH LOW HIGH LOW HIGH D o u ble D o u ble D o u ble Sampling rate Standard Standard Standard Sampling frequency gro u p 48 kHz 44.1 kHz 32 kHz Prohibited (test mode) 48 kHz 44.1 kHz 32 kHz Prohibited (test mode) 96 kHz 88.2 kHz 64 kHz Sampling frequency 48 kHz (default) 44.1 kHz 32 kHz
R1 (pin 20) and R0 (pin 19) and functions are shown in table 6.
Note that in parallel control mode, clock output enable/disable controls are not available. Also note that the reset function does not affect the sampling
frequency group or sampling rate select settings (it is determined by R2, R1, R0 condition).
NIPPON PRECISION CIRCUITS--12
SM8701BM
TYPICAL APPLICATION
CPU
+3.3V +5V
MLEN/R2 P/S VDD
C3
MCK/R1 MDT/R0 RSTN SO3 VDDO
C6
GND XTO
C1 C2 X'tal
384fs 256fs 768fs
XTI GNDP
C4
GNDO SO2 SO4 SO1 MON
VDDP VDD3
C5
33.8688MHz
MO
27MHz(Inverted) 27MHz
SM8701BM
s
s
s
s
Connect the decoupling capacitors (approximately 0.1F and 1000pF) in parallel, as close to power supply pins as possible. In order to minimize noise, it is useful to make ground as solid pattern. Master clock stability affects the other outputs stability. In the usage of crystal oscillator, load capacitor and crystal oscillator should be placed as close to the SM8701BM as possible, and wired shortly. Select crystal oscillators and load capacitance carefully, depending on the condition, as those combination will have influence on the frequency accuracy(C1, C2). Supply pattern including decoupling capacitors needs careful attention to make the IC's performance better, since the SM8701BM outputs several high frequency clocks. Pattern capacitance from output pins should not to be large for prevention of the noise. Connecting output pins to buffers is useful if it is necessary.
s
Power supply and ground pins. * VDD :5V Power supply for digital block (CPU I/F*, XT1, XT2). * GND : Ground for digital block (CPU I/F*, XT1, XT2, output block except SO3). * VDDP :5V Power supply for PLL block. * GNDP : Ground for PLL block. * VDDO :3.3V Power supply for SO3. * GNDO : Ground for SO3. * VDD3 :3.3V Power supply for output block (except SO3).
*: CPU I/F: MDT/R0, MCK/R1, MLEN/R2, RSTN, P/S
NIPPON PRECISION CIRCUITS--13
SM8701BM
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698
NIPPON PRECISION CIRCUITS INC.
NC9822BE
2000.1
NIPPON PRECISION CIRCUITS--14

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