TSA5055T datasheet(4/20 Pages) PHILIPS

部品番号	TSA5055T

部品情報	2.65 GHz bidirectional I2C-bus controlled synthesizer

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メーカー	PHILIPS [NXP Semiconductors]

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1999 Aug 11

4

Philips Semiconductors

Product speciﬁcation

2.65 GHz bidirectional I2C-bus controlled

synthesizer

TSA5055T

PINNING

SYMBOL

DESCRIPTION

PD

1

charge-pump output

Q1

2

crystal oscillator input 1

Q2

3

crystal oscillator input 2

SDA

4

serial data input/output

SCL

5

serial clock input

P7

6

port output/input (general

purpose)

P6

7

port output/input (ADC)

P5

8

port output/input (general

purpose)

P4

9

port output/input (general

purpose)

P3

10

port output (also used for address

selection)

P0

11

port output

VCC

12

voltage supply

RFIN1

13

RF signal input 1

RFIN2

14

RF signal input 2 (decoupled)

GND

15

ground

UD

16

drive output

Fig.2 Pin configuration.

handbook, halfpage

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

TSA5055T

PD

Q1

Q2

SDA

SCL

P7

P6

P5

UD

GND

RFIN2

RFIN1

VCC

P0

P3

P4

MBC304

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.

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