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U2781B
Frequency Synthesizer
Description
The programmable frequency synthesizer IC U2781B for P-controlled application is realized with TEMIC's advanced UHF process which is very suitable for combinations of fast ECL logic and low-current I2L logic. The benefits are high input sensitivity in connection with low power consumption and therefore small packages (SSO20). This makes the device a perfect choice for cordless phones and handheld cellular radio sets up to 1.1 GHz. Electrostatic sensitive device. Observe precautions for handling.
Features
D D D D D D D D D
Very low current consumption (typ. 3 V/ 5 mA) Supply voltage range: 2.7 to 5.5 V Max. input frequency: 1.1 GHz Programmable prescaler 64/ 65 or 128/ 129 Controlled by 3-wire bus with fclock up to 500 kHz Status output for PLL lock/ unlock condition Very fast phase detector SSO20 package ESD protection in accordance with MIL-STD. 883 method 3015 class 2
Benefits
D Very low current consumption extends talk time D Few external components and SSO package save costs
and space
Block Diagram
Osci Osco VS GND 1 3 5 7 1-bit latch load control 18-bit shift register Phase detector Charge pump 15-bit latch Oscillator 14-bit reference counter Mo 17 LDo 8 VSCP 4 CP 6
Clock 11 Data 13 Enable 14
18-bit latch Prescaler 64/65 128/129 7-bit swallow counter 11-bit main counter
15
PS
RFi 10
93 7785 e
Figure 1. Block diagram
Ordering Information
Extended Type Number U2781B-AFS U2781B-AFSG3 Package SS020 SS020 Remarks Rail, MOQ 830 pcs Tape and reel, MOQ 4000 pcs
TELEFUNKEN Semiconductors Rev. A3, 26-Nov-97
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U2781B
Functional Description
The IC is controlled by a 3-wire bus with Clock, Data and Enable inputs for programming the scaling factors of the programmable counter, the reference counter and the prescaler. A TCXO can be connected to the oscillator input (OSCi) as an alternative solution to the common crystal reference oscillator. In that case, the oscillator output (OSCo) should be left open. The charge pump-output operates as switched current sources. The characteristics of the phase-locked loop can be determinated by the external low-pass filter. The phase characteristic of the phase detector is convertible and thus matchable to different frequency/ tuning voltage characteristics.
Pin Description
NC Osco VSCP VS CP GND
2 3 4 5 6 7
19 NC 18 NC 17 Mo 16 NC 15 PS 14 Enable 13 Data 12 NC 11 Clock
14775
LDo 8 NC 9
RFi 10
Figure 2. Pinning
Absolute Maximum Ratings
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Parameters
Supply voltage RF input Oscillator input voltage Oscillator output voltage Bus input voltage Phase-select input voltage Charge-pump input voltage Storage temperature
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Symbol VS VRF VOsci VOsco VBUS VPS VSCP Tstg Value - 0.3 to 6 VS 1 1.5 6 6 6 - 40 to 125 Unit V V V V V V V C TELEFUNKEN Semiconductors Rev. A3, 26-Nov-97
Osci
1
20
NC
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Symbol Osci NC Osco VSCP Vs CP GND LDo NC RFi Clock NC Data Enable PS NC Mo NC NC NC
Function Oscillator input Not connected Oscillator output Charge-pump supply voltage Supply voltage Charge-pump output Ground Lock-detector output Not connected VCO input 3-wire bus Clock Not connected 3-wire bus Data 3-wire bus Enable Phase select input Not connected Monitor output for fp and fr Not connected Not connected Not connected
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*) RMS voltage at 50 W Frequency range RF input Input voltage fi = 200 to 1100 MHz Frequency range Parameters DC supply Supply voltage Supply current Supply voltage CP Supply current CP Junction ambient Supply voltage Ambient temperature Tamb = 25_C, VS = 2.7 to 5.5 V, unless otherwise specified
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Electrical Characteristics Thermal Resistance Operating Range
Parameters SSO20 Parameters Symbol RthJA Symbol VS Tamb Value 2.7 to 5.5 - 40 to 85 Value 140
TELEFUNKEN Semiconductors Rev. A3, 26-Nov-97 Scaling factor prescaler Scaling factors main counter Scaling factors swallow counter Reference oscillator Input voltage
Scaling factor reference counter 3-wire bus (Clock, Data, Enable) and PS High input voltage Low input voltage High input current Low input current Monitor output (Emitter follower) High output voltage Vs = 3 V Low output voltage IMO = 0.5 mA Charge-pump output Source current VCP = 5 V Sink current Leakage current VCP = 5 V Lock-detektor output (open collector) Saturation voltage ILD = 1 mA Leakage current VLD = 5 V
Rs = 50 *) Rs = 50 *)
Rs = 50 *) Rs = 50 *)
VCP = 5 V, PLL in locked condition
Vs = 3 V
Test Conditions / Pin
Symbol
Isource Isink Ileak
Vimin Vimax fimin fimax SR
Vimin Vimax fimin fimax SPSC SM SS
Vs Is VSCP ISCP
Vsat Ileak
ViH ViL
ViH ViL IiH IiL
1100
Min
2.1
1.5 0
2.7
Vs
-5
4
4 0
20 200 50 1250 64/128
Typ
20 200 0,1 20
0.2 5
2.2 1.8
0.9
-1 1 5
1
5
U2781B
16383
2047 127
Max
0.4
1.9
0.4 5
5.5
5.5
mVRMS mVRMS MHz MHz
mVRMS mVRMS MHz MHz
Unit K/W
Unit V C
Unit
mA mA nA
V mA V A
V V A A
V nA
3 (10) V V
U2781B
Functional Description
The reference- and the programmable counter can be programmed by the 3-wire bus (Clock, Data and Enable). The Data Signal is transfered bit by bit into the shift register during the rising edge, starting with the MSB-bit. As soon as the enable signal is in high condition, the content of the shift register will be taken over either into the 15-bit reference counter latch (C = H) or into the 18-bit latch of the programmable counter (C = L)
Reference Counter (15bit shift register)
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LSB C MSB PSC R0 R1 R2 R3 R4 R5 R6AAA R8 R7AAAR9 R10 R11 R12 R13 C: Control bit High PSC: Prescaler scaling factor bit: High - 64/65 Low - 128/129 SPSC = 64 or 128 R0 to R13: These bits are setting the reference counter SR SR = R0 20 + R1 21 + to + R12 212 + R13 permitted scaling factors for SR: 4 to 16383 213
Programmable Counter (18-bit shift register)
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LSB C MSB M10 S0 S1 S2 S3 S4 S5 S6 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 C: S0 to S6: Control bit Low These bits are setting the swallow counter SS. SS = S0 20 + S1 21 + to + S5 25 + S6 26 permitted scaling factors for SS: 0 to 127, SS < SM M0 to M10 : These bits are setting the main counter SM. SM = M0 20 + M1 21 + to + M9 29 + M10 permitted scaling factors for SM: 4 to 2047 210 Total scaling factor SP of the programmable counter SP = (SPSC SM) + SS Condition: SS < SM
VCO Frequency
fVCO = ((SPSC SM) + SS) fRefOsc / SR
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U2781B
Timing 3-Wire Bus
MSB P 17 PSC Data P 16 R 13 P9 R7 P8 R6 P0 R0 LSB C = 0 : Prog. scaler data C = 1 : Reference scaler date
Clock
Enable t5 t1 All times t1 to t5 > 1 ms Figure 3. t2 t3 t4
93 7787 e
Phase-Detector Polarity
The polarity of the phase detector can be changed with the PS input. Depending on the PS input level, the chargepump current will also be inverted. The monitor output PS = High or Open CP MO Isink fR Isource fR 0 fR signal MO (emitter follower output with ECL level) will be switched over from fP to fR simultanously.
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PS = Low fR > fP fR < fP fR = fP CP Isource Isink 0 MO fP fP fP For increasing tuning voltage and increasing frequency: decreasing frequency: PS = High or open PS = Low. TELEFUNKEN Semiconductors Rev. A3, 26-Nov-97
Depending on the VCO frequency versus tuning voltage characteristic, the PS input has to be programmed as follows:
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U2781B
Pulse Diagram Phase and Lock Detector
fp (fvco/Tp) fr (fosc/Tp) Vcp LD
93 7786 e
Figure 4.
The LD output is in unlocked condition at low level and the pulsewidth is in reference to the phase respectively frequency difference at the phase detector. If the phase detector output pulses are smaller than 100 ns, the LD output goes high and indicates "lock" condition.
Test Circuit
Input sensitivity
10 k
Frequency Counter Monitor
Enable Data Clock
U2781B
VS = 3 V
1m
10 n
1n
RF Test Generator
94 8904
Figure 5.
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U2781B
Typical Input Sensitivity
1000 500 200 100 50 20 10 5 2 1 .5 .2 .1 0
93 7789 e
mVRMS ( 50 Ohm)
dBm ( 50 Ohm)
+10 +5 0 -5 - 10 - 15 - 20 - 25 - 30 - 35 - 40 - 45 - 50 - 55 - 60 - 65
200 400
600 800 1000 1200 1400 1600 Frequency ( MHz )
Figure 6.
Application Circuit
94 8905
Enable Data Clock
U2781B
alternatively to external TCXO 2 x 10p VSCP = 3 to 6 V VS = 3 V 1m 1m 10n Loop filter 10n
Figure 7.
10n LD 10k
1n VCO Tuning voltage
TELEFUNKEN Semiconductors Rev. A3, 26-Nov-97
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U2781B
Input Impedance
j
0.5j
2j
0.2j
5j
0
0.2
0.5
1
2
5
1
100 MHz
-0.2j 500 MHz
1 GHz -0.5j 1.5 GHz -2j Z0 = 50 W
96 11685
-j
Figure 8.
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TELEFUNKEN Semiconductors Rev. A3, 26-Nov-97
A A
A A
AA AA AA AA AA AA
-5j
U2781B
Package Information
Package SSO20
Dimensions in mm
6.75 6.50 5.7 5.3 4.5 4.3
1.30 0.25 0.65 5.85 20 11 0.15 0.05 0.15 6.6 6.3
technical drawings according to DIN specifications 13007
1
10
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U2781B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
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