Page 1
SP5655
2·7GHz Bidirectional I2C Bus Controlled Synthesiser
Advance Information
Supersedes July 1996 version, DS3743-4.3 DS3743 - 5.0 June 1998
The SP5655 is a single chip frequency synthesiser designed
for TV tuning systems. Control data is entered in the standard
I2C BUS format. The device contains 2 addressable current
limited outputs and 4 addressable bidirectional open-collector
ports, one of which is a 3-bit ADC. The information on these
ports can be read via the I
2
I
C BUS address and 3 programmable addresses,
2
C BUS. the device has one fixed
programmed by applying a specific input voltage to one of the
current limited outputs. This enables two or more synthesisers
to be used in a system.
FEATURES
■ Complete 2·7GHz Single Chip System
■ High Sensitivity RF Inputs
■ Programmable via I
2
C BUS
■ Low Power Consumption (5V, 30mA)
■
Low Radiation
■ Phase Lock Detector
■ Varactor Drive Amp Disable
■ 6 Controllable Outputs, 4 Bidirectional
■ 5-Level ADC
■ Variable I
■ ESD Protection: 4kV, Mil-Std-883C, Method 3015
2
C BUS Address for Multi-tuner Applications
(1)
■ Switchable 4512/1024 Reference Divider
■ Pin and Function Compatible with SP5055S
(1) Normal ESD handling precautions should be observed.
(2) The SP5055S does not have a switchable reference
division ratio.
(2)
CHARGE PUMP
CRYSTAL Q1
CRYSTAL Q2
SDA
SCL
†
I/O PORT P7
*
I/O PORT P6
†
I/O PORT P5
† = Logic level I/O port
*
= 3-bit ADC input
Fig. 1 Pin connections – top view
APPLICATIONS
■ Satellite TV
■ High IF Cable Tuning Systems
THERMAL DATA
u
= 41°C/W
JC
u
= 111°C/W
JA
ORDERING INFORMATION
SP5655 KG/MPAS (Tubes)
SP5655S KG/MPAD (Tape and reel)
1
2
3
4
SP5655
5
6
7
8
16
15
14
13
12
11
10
9
DRIVE OUTPUT
V
EE
RF INPUT
RF INPUT
V
CC
P0 OUTPUT PORT
P3 OUTPUT PORT/
ADD SELECT
I/O PORT P4
†
MP16
Page 2
SP5655
ELECTRICAL CHARACTERISTICS
T
= 220°C to 180°C, V
AMB
These Characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature
and supply voltage ranges unless otherwise stated.
= 14·5V to 15·5V, reference frequency = 4MHz.
CC
Characteristic Pin
Supply current
Prescaler input voltage
Prescaler input impedance
Prescaler input capacitance
SDA, SCL
Input high voltage
Input low voltage
Input high current
Input low current
Leakage current
SDA
Output voltage
Charge pump current low
Charge pump current high
Charge pump output leakage current
Charge pump drive output current
Charge pump amplifier gain
Recommended crystal series resistance
Crystal oscillator drive level
Crystal oscillator negative resistance
External reference input frequency
External reference input amplitude
Output Ports
P0, P3 sink current
P0, P3 leakage current
P4-P7 sink current
P4-P7 leakage current
Input Ports
P3 input current high
P3 input current low
P4, P5, P7 input voltage low
P4, P5, P7 input voltage high
P6 input current high
P6 input current low
12
13,14
13,14
13, 14
4,5
4,5
4,5
4,5
4,5
4
1
1
1
16
2
2
2
2
11, 10
11, 10
9-6
9-6
10
10
9,8,6
9,8,6
7
7
Value
Min. Max.
50
Typ.
30
40
300
50
2
3
0
5·5
1·5
10
210
10
0·4
650
6170
65
500
6400
10
200
80
70
1000
2
8
200
1
1·5
750
0·7
10
10
10
110
210
0·8
2·7
110
210
Units
mA
mVrms
Ω
pF
V
V
µA
µA
µA
V
µA
µA
nA
µA
Ω
mV p-p
Ω
MHz
mVrms
mA
µA
mA
µA
µA
µA
V
V
µA
µA
Conditions
VCC = 4·5V to 5·5V (note 1)
120MHz to 2·7GHz sinewave,
see Fig. 5
Input voltage = V
CC
Input voltage = 0V
When V
CC
= 0V
Sink current = 3mA
Byte 4, bit 2 = 0, pin 1 = 2V
Byte 4, bit 2 = 1, pin 1 = 2V
Byte 4, bit 4 = 1, pin 1 = 2V
V pin 16 = 0·7V
Parallel resonant crystal (note 2)
AC coupled sinewave
AC coupled sinewave
V
= 12V
OUT
V
= 13·2V
OUT
V
= 0·7V
OUT
V
= 13·2V
OUT
V pin 10 = V
CC
V pin 10 = 0V
See Table 3 for ADC levels
NOTES
1. Maximum power consumption is 220mW with V
2. Resistance specified is maximum under all conditions.
= 5·5V and all ports off.
CC
2
Page 3
ABSOLUTE MAXIMUM RATINGS
All voltages are referred to VEE and pin 3 at 0V
Parameter
Pin
Value
SP5655
Units
Max.Min.
Conditions
Supply voltage
RF input voltage
Port voltage
Total port output current
Address select voltage
RF input DC offset
Charge pump DC offset
Drive output DC offset
Crystal oscillator DC offset
SDA, SCL input voltage
Storage temperature
Junction temperature
12
13,14
6-11
6-9
10, 11
6-9
10
13-14
1
16
2
4,5
20·3
20·3
20·3
20·3
20·3
20·3
20·3
20·3
20·3
20·3
255
7
2·5
14
6
14
50
10·3
V
CC
VCC10·3
10·3
V
CC
10·3
V
CC
VCC10·3
6
1150
1150
V
V p-p
V
V
V
mA
V
V
V
V
V
V
°C
°C
Port in off state
Port in on state
Port in on state
RF IN
SCL
SDA
PREAMP
13
14
5
4
ADDRESS
SELECT
PRESCALER
4
16
POWER
ON DET
POR
I2C BUS
TRANSCEIVER
3-BIT
ADC
LEVEL
3 TTL
COMP
15-BIT
PROGRAMMABLE
DIVIDER
15-BIT LATCH
DIVIDE RATIO
6-BIT LATCH
PORT INFO
2
11
P0
F
PD
LOCK
DET
F
L
CONTROL DATA
LATCHES
AND
CONTROL LOGIC
4
PORT OUTPUT DRIVERS
9876
10
P4 P5 P6 P7
P3
PHASE
COMP
F
4
F
COMP
DIVIDER
4
512/1024
DN
CHARGE
PUMP
UP
CP TO OS
OSC
2
Q1
CRYSTAL
3
Q2
1
CHARGE PUMP
16
DRIVE/
VARICAP OUT
V
CC
15
V
EE
Fig. 2 Block diagram
3
Page 4
SP5655
FUNCTIONAL DESCRIPTION
The SP5655 is programmed from an I2C Bus. Data and
Clock are fed in on the SDA and SCL lines respectively, as
defined by the I2C Bus format. The synthesiser can either
accept new data (write mode) or send data (read mode). The
LSB of the address byte (R/W) sets the device into write mode
if it is low and read mode if it is high. The Tables in Fig. 3
illustrate the format of the data. The device can be programmed to respond to several addresses, which enables the
use of more than one synthesiser in an I
Table 4 shows how the address is selected by applying a
voltage to P3.
When the device receives a correct address byte, it pulls
the SDA line low during the acknowledge period, and during
following acknowledge periods after further data bytes are
programmed. When the device is programmed into the read
mode, the controller accepting the data must pull the SDA line
low during all status byte acknowledge periods to read another status byte. If the controller fails to pull the SDA line low
during this period, the device generates an internal STOP
condition, which inhibits further reading.
WRITE Mode (Frequency Synthesis)
When the device is in write mode bytes 2 and 3 select the
synthesised frequency, while bytes 4 and 5 control the output
port states, charge pump, reference divider ratio and various
test modes.
Once the correct address is received and acknowledged,
the first bit of the next byte determines whether that byte is
interpreted as byte 2 or 4; a logic 0 for frequency information
and a logic 1 for control and output port information. When
byte 2 is received the device always expects byte 3 next.
Similarly, when byte 4 is received the device expects byte 5
next. Additional data bytes can be entered without the need
to readdress the device until an I
nised. This allows a smooth frequency sweep for fine tuning
or AFC purposes.
If the transmission of data is stopped mid-byte (for example, by another device on the bus) then the previously programmed byte is maintained.
Frequency data from bytes 2 and 3 are stored in a 15-bit register
and used to control the division ratio of the 15-bit programmable
divider. This is preceded by a divide-by-16 prescaler and amplifier to
give excellent sensitivity at the local oscillator input, see Fig. 5. The
input impedance is shown in Fig. 7.
The programmed frequency can be calculated by multiplying the programmed division ratio by 16 times the comparison
frequency F
. When frequency data is entered, the phase
COMP
comparator, via a charge pump and varicap drive amplifier,
adjusts the local oscillator control voltage until the output of
the programmable divider is frequency and phased locked to
the comparison frequency.
The reference frequency may be generated by an external
source capacitively coupled into pin 2, or provided by an onchip crystal controlled oscillator. The comparison frequency
F
is derived from the reference frequency via the refer-
COMP
ence divider. The reference divider division ratio is switchable
2
C stop condition is recog-
2
C Bus system.
from 512 to 1024, and is controlled by bit 7 of byte 4 (TS0); a
logic 1 to 512, a logic 0 for 1024. The SP5655 differs from the
SP5055 in this respect, only 512 being available on the
SP5055. Note that the comparison frequency is 7·8125kHz
when a 4MHz reference is used, and divide by 512 is selected.
Bit 2 of byte 4 of the programming data (CP) controls the
current in the charge pump circuit, a logic 1 for ±170µA and a
logic 0 for ±50µA, allowing compensation for the variable
tuning slope of the tuner and also to enable fast channel
changes over the full band. When the device is frequency
locked, the charge pump current is internally set to ±50µA
regardless of CP.
Bit 4 of byte 4 (T0) disables the charge pump when it is set
to a logic 1.
Bit 8 of byte 4 (OS) switches the charge pump drive
amplifier’s output off when it is set to a logic 1.
Bit 3 of byte 4 (T1) enables various test modes when set
high. These modes are selected by bits 5, 6 and 7 of byte 4
(TS2, and TS1, TS0) as detailed in Table 5. When T1 is set
low, TS2 and TS1 are assigned a ‘don’t care’ condition, and
TS0 selects the reference divider ratio as previously described.
Byte 5 programs the output ports P0 and P3 to P7; a logic
0 for a high impedance output and a logic 1 for low impedance
(on).
READ Mode
When the device is in read mode the status byte read from
the device on the SDA line takes the form shown in Table 2.
Bit 1 (POR) is the power-on reset indicator and is set to a
logic 1 if the V
supply to the device has dropped below 3V
CC
(at 25˚C), for example, when the device is initially turned on.
The POR is reset to 0 when the read sequence is terminated
by a stop command. When POR is set high (at low V
CC
), the
programmed information is lost and the output ports are all set
to high impedance.
Bit 2 (FL) indicates whether the device is phase locked, a
logic 1 is present if the device is locked, and a logic 0 if the
device is unlocked.
Bits 3, 4 and 5 (I2, I1, I0) show the status of the I/O Ports
P7, P5 and P4 respectively. A logic 0 indicates a low level and
a logic 1 a high level. If the ports are to be used as inputs they
should be programmed to a high impedance state (logic 1).
These inputs will then respond to data complying with TTL
type voltage levels.
Bits 6, 7 and 8 (A2, A1, A0) combine to give the output of
the 5-level ADC. The ADC can be used to feed AFC information to the microprocessor from the IF section of the receiver,
as illustrated in the typical application circuit.
APPLICATION
A typical application is shown in Fig. 4. All input/output
interface circuits are shown in Fig. 6. The SP5655 is function and
pin equivalent to the SP5055 device apart from the switchable
reference divider, and has much lower power dissipation, improved RF sensitivity and better ESD performance.
4
Page 5
SP5655
Address
Programmable divider
Programmable divider
Charge pump and test bits
I/O port control bits
Table 1 Write data format (MSB transmitted first)
Address
Status byte
A2
1
0
0
0
0
A1
0
1
1
0
0
Voltage input to P6
A0
0
1
0
1
0
0·6V
0·45V
0·3V
0·15V
0V to 0·15V
CC
CC
CC
CC
Table 3 ADC levels
MSB
1
0
2
1
P7
1
7
0
1
14
13
2
2
6
5
2
2
CP
T1
P6
P5
1FL0I20I10
POR
Table 2 Read data format
to 13·2V
to 0·6V
to 0·45V
to 0·3V
CC
CC
CC
CC
MA1
LSB
0
0
12
11
2
2
4
3
2
2
T0
TS2
P4
P3
I0
MA0
0
0
1
0
0
1
1
1
MA0
MA1
10
2
2
2
TS1
X
MA1
A2
MA0
2
2
TS0
X
A1
0
9
8
2
1
0
2
OS
P0
1
A0
Address select input voltage
0V to 0·2V
Always valid
to 0·7V
0·3V
CC
0·8VCC to 13·2V
A
A
A
A
A
A
A
CC
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 1
Byte 2
CC
Table 4 Address selection
T1
TS2
TS1
TS0
0
X
X
0
Normal operation, test modes disabled, reference divider ratio = 1024
0
X
X
1
Normal operation, test modes disabled, reference divider ratio = 512
1
0
0
X
Charge pump source (down). Status bit FL set to 0
1
0
1
X
Charge pump sink (up). Status bit FL set to 1
1
1
0
0
Ports P4, P5, P6, P7set to state X
1
1
0
1
Port P7 = F
1
1
1
NOTES
X = don’t care
For further details of test modes, see Table 6
X
Port P7 = F
/2; P4, P5, P6 set to state X
PD
; P6 = F
PD
Table 5 Operation modes
A : Acknowledge bit
MA1, MA0 : Variable address bits (see Table 4)
CP : Charge Pump current select
T1 : Test mode selection
T0 : Charge pump disable
TS2, TS1, TS0 : Operation mode control bits (see Table 5)
OS : Varactor drive Output disable Switch
P7, P6, P5, P4, P3, P0 : Control output port states
POR : Power On Reset indicator
FL : Phase lock detect flag
I2, I1, I0 : Digital information from ports P7, P5 and P4 respectively
A2, A1, A0 : 5-level ADC data from P6 (see Table 3)
X : Don’t care
Operation mode description
; P4, P5 set to state X
COMP
Fig. 3 Data formats
5
Page 6
SP5655
112V
SATELLITE
TUNER
OSCILLATOR
OUTPUT
VARICAP
INPUT
10n
112V
P4
P5
P6
P7
SCL
2
I
C BUS SDA
4MHz
CRYSTAL
IF SECTION
AFC OUT
15V
CONTROL
MICRO
IF SIGNAL
SP5655
39n
22k
8
7
6
5
4
3
2
1
18p
180n
9
P3
P0
15V
1n
10k47k
V
0·1µ
1n
130V
22k
T
BCW31
10
11
12
13
14
15
16
Fig. 4 Typical application
300
150
OPERATING
WINDOW
100
(mV RMS INTO 50 Ω )
IN
V
50
120 1000 2000 2700 3000 3500
FREQUENCY (MHz)
Fig. 5 Typical input sensitivity
6
Page 7
400
SP5655
V
V
REF
400
CC
CHARGE
PUMP
RF INPUTS
RF input
V
CC
CRYSTAL Q1
CRYSTAL Q2
SCL/SDA
Loop amplifier
3k
*
*
ON SDA ONLY
ACK
150
DRIVE
OUTPUT
OS
(O/P DISABLE)
V
CC
67k
Reference oscillator
V
CC
3k
Ports P7-P4
SCL and SDA inputs
V
PORT
Fig. 6 SP5655 input/output interface circuits
CC
PORT P3
ONLY
Ports P0-P3
3k
PORT
12k
7
Page 8
SP5655
j
1
j
0.5
j
0.2
j
2
j
5
0.5
j
0.5
S
11:ZO
= 50Ω
0.2
0
2·6GHz
j
0.2
2
2
NORMALISED TO 50Ω FREQUENCY MARKER STEP = 500MHz
Fig. 7 Typical input impedance,
APPLICATION NOTES
An application note, AN168, is available for designing with
synthesisers such as the SP5655. It covers aspects such as loop
filter design, decoupling and I
The application note is published in the Mitel Semiconductor
Media IC Handbook. A generic test/demonstration board has
been produced, which can be used for the SP5655. A circuit
diagram and layout for the board are shown in Figs. 8 and 9.
15V
R11 3k
S1
S2
R12 1k
TP1
DATA/SDA
CLOCK/SCL
ENABLE/ADDRESS SEL
NOTE
To use an external reference,
capacitor C6 must be fitted
and capacitor C1 removed
from the board.
2
C bus radiation problems.
C6 10n
(NOT FITTED,
SEE NOTE)
X1
4MHz
C12 100p
C13 100p
P1
P4
R1 4·7k
D1
67891011
PIN NO.
EXTERNAL
REFERENCE
SK2
C1
18p
R2 4·7k
D2
C2
220n
R3 4·7k
D3
1
2
3
4
5
6
7
8
1
j
2
2
1
5
j
5
2
2
j
2
The board can be used for the following purposes:
(A) Measuring RF sensitivity perfomance
(B) Indicating port function
(C) Synthesising a voltage controlled oscillator
(D)Testing external reference sources
The programming codes relevant to these tests are given in
Table 6.
15V 130V 112V
P2
C7
100nC8100nC9100n
C3 47n
R7 22k
16
15
14
13
SP5655
12
11
10
9
R4 4·7kD4R5 4·7k
C4 1n
C10 1n
D5
15V
R13 12k
R6 4·7k
D6
R8 22k
TR1
2N3904
112V
R9 10k R10 47k
C14 10n
C5 1n
R14 22k
C11
1n
112V
TR2
2N3906
P3
VAR
GND
SK1
RF INPUT
Fig. 8 Test board circuit
8
Page 9
Top view (ground plane)
SP5655
TP1 = PIN 3 DC BIAS
Underside (surface mounted components side)
NOTES
1. CIRCUIT SCHEMATIC IS SHOWN IN FIG. 8
2. ALL SUFACE MOUNT COMPONENTS ARE
MOUNTED ON UNDERSIDE OF BOARD
Fig. 9 Test board layout
9
Page 10
SP5655
TEST MODES
As explained in the functional description, The SP5655 can
be programmed into a numb er of test modes. These are invoked
by programming Hex codes into byte 4, those most commonly
used being shown in Table 6.
Other codes will also apply due to don’t care conditions, which
are assumed to be 1 in the Table.
Operation mode description
Normal operation, reference divider ratio = 1024
Normal operation, reference divider ratio = 512
Charge pump source (down), FL set to 0
Charge pump sink (up), FL set to 1
Port P7 = F
Port P7 = F
Charge pump disable, reference divider ratio = 512
Varactor line disable, reference divider ratio = 512
Charge pump and varactor line disable, reference divider ratio = 512
/2
PD
, P6 = F
PD
COMP
Table 5 Operation modes
NOTE:
When looking at F
PD
or F
signals from ports P7 and P6. byte
COMP
should be sent twice, first to set the desired reference division
ratio then to switch on the chosen test mode.
The pulses can then be measured by simply connecting an
oscilloscope or counter to the relevant output pin on the test board.
Hex code (byte 4)
CP high mode
CC
CE
E2
E6
EA
EE
DE
CF
DF
CP low mode
8C
8E
A2
A6
AA
AE
9E
8F
9F
10
Page 11
Page 12
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