TSA5514AT PHILIPS [NXP Semiconductors], TSA5514AT Datasheet - Page 6

• Manufacturer Part Number: TSA5514AT
• Description: 1.3 GHz bidirectional I2C-bus controlled synthesizer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The TSA5514 is controlled via the two-wire I
programming, there is one module address (7 bits) and the
R/W bit for selecting READ or WRITE mode.
WRITE mode: R/W = 0 (see Table 1)
After the address transmission (first byte), data bytes can
be sent to the device. Four data bytes are required to fully
program the TSA5514. The bus transceiver has an
auto-increment facility which permits the programming of
the TSA5514 within one single transmission
(address + 4 data bytes).
The TSA5514 can also be partially programmed on the
condition that the first data byte following the address is
Table 1 Write data format
Note to Table 1
Note
1. x = don’t care
October 1992
Address
Programmable divider
Programmable divider
Charge-pump and test bits
Output ports control bits
*
MA1, MA0
A
N14 to N0
N = N14
CP
CP = 0
CP = 1
P7 to P0 = 1
P7 to P0 = 0
T1, T0, OS = 0 0 0
T1 = 1
T0 = 1
OS = 1
1.3 GHz bidirectional I
2
14
+ N13 2
13
+...
N1
MSB
N7
P7
2
1
0
1
C-bus controlled synthesizer
2
1
+N0
N14
CP
N6
P6
2
1
C-bus. For
Not valid for TSA5514T
programmable address bits (see Table 4)
acknowledge bit
programmable divider bits
charge-pump current
50 A
220 A
open-collector output is active
outputs are in high impedance state
normal operation
P6 = f
3-state charge-pump
operational amplifier output is switched off (varicap drive disable)
N13
N5
T1
P5
0
ref
, P7 = f
6
N12
byte 2 or byte 4. The meaning of the bits in the data bytes
is given in Table 1. The first bit of the first data byte
transmitted indicates whether frequency data (first bit = 0)
or charge pump and port information (first bit = 1) will
follow. Until an I
controller, additional data bytes can be entered without the
need to re-address the device. This allows a smooth
frequency sweep for fine tuning or AFC purpose. At
power-on the ports are set to the high impedance state.
The 7.8125 kHz reference frequency is obtained by
dividing the output of the 4 MHz crystal oscillator by 512.
Because the input of UHF/VHF signal is first divided by 8
the step size is 62.5 kHz. A 3.2 MHz crystal can offer step
sizes of 50 kHz.
N4
T0
P4
0
DIV
N11
N3
0
x
x
2
MA1
N10
C-bus STOP condition is sent by the
N2
P2
x
MA0
P1*
N9
N1
x
LSB
P0*
OS
N8
N0
0
Product specification
TSA5514
A
A
A
A
A
byte 1
byte 2
byte 3
byte 4
byte 5