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TSA5055T

2.65 GHz bidirectional I2C-bus controlled synthesizer

Philips Electronics 

Philips Semiconductors

2.65 GHz bidirectional I2C-bus controlled

synthesizer

Product specification

TSA5055T

PINNING

SYMBOL

PD

Q1

Q2

SDA

SCL

P7

P6

P5

P4

P3

P0

VCC

RFIN1

RFIN2

GND

UD

PIN

DESCRIPTION

1 charge-pump output

2 crystal oscillator input 1

3 crystal oscillator input 2

4 serial data input/output

5 serial clock input

6 port output/input (general

purpose)

7 port output/input (ADC)

8 port output/input (general

purpose)

9 port output/input (general

purpose)

10 port output (also used for address

selection)

11 port output

12 voltage supply

13 RF signal input 1

14 RF signal input 2 (decoupled)

15 ground

16 drive output

handbook, halfpage

PD 1

Q1 2

Q2 3

SDA 4

SCL 5

P7 6

P6 7

P5 8

16 UD

15 GND

14 RFIN2

13 RFIN1

TSA5055T

12 VCC

11 P0

10 P3

9 P4

MBC304

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

General

The TSA5055T is controlled via the 2-wire I2C-bus. For

programming, there is one (7-bit) module address 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 needed to fully

program the TSA5055T. The bus transceiver has an

auto-increment facility that permits the programming of the

TSA5055T within one single transmission (address + four

data bytes).

The TSA5055T can also be partly 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. 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 the RF signal is first divided by 16,

the step size is 125 kHz. A 3.2 MHz crystal can offer a step

size of 100 kHz.

1999 Aug 11

4

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