TSA5512AT View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
TSA5512AT Datasheet PDF : 20 Pages
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Philips Semiconductors
1.3 GHz Bidirectional I2C-bus controlled synthesizer
Product specification
TSA5512
PINNING
SYMBOL
PD
Q1
Q2
n.c.
SDA
SCL
P7
n.c.
P6
P5
P4
P3
P2
P1
P0
VCC
RFIN1
RFIN2
VEE
UD
PIN
SOT102
SOT109
SOT163
SOT266
DESCRIPTION
1
1
1 charge-pump output
2
2
2 crystal oscillator input 1
3
3
3 crystal oscillator reference voltage
−
−
4 not connected
4
4
5 serial data input/output
5
5
6 serial clock input
6
6
7 port output/input (general purpose)
−
−
8 not connected
7
7
9 port output/input for general purpose ADC
8
8
10 port output/input (general purpose)
9
9
11 port output/input (general purpose)
10
10
12 port output/input for address selection
11
11
13 port output
12
−
14 port output
13
−
15 port output
14
12
16 voltage supply
15
13
17 UHF/VHF signal input 1
16
14
18 UHF/VHF signal input 2 (decoupled)
17
15
19 ground
18
16
20 drive output
FUNCTIONAL DESCRIPTION
The TSA5512 is controlled via the two-wire I2C-bus. For 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 TSA5512. The bus transceiver has an auto-increment facility which permits the programming of the
TSA5512 within one single transmission (address + 4 data bytes).
The TSA5512 can also be partially programmed on the condition that the first data byte following the address is 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
I2C-bus STOP condition is sent by the 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.
October 1992
6
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