TA1296FN
Preliminary
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA1296FN
Down-Converter IC with PLL for Satellite Tuner
The TA1296FN is a wideband down-converter which can
operate at input frequency ranging from 850 MHz to 2200 MHz.
Intended primarily for use in satellite tuners, this IC includes an
oscillator, a mixer, an IF amplifier and a PLL.
The I
2
C bus data format is used as the data control format.
The supply voltage of 5.0 V helps minimize the tuner’s power
dissipation, while the compact 30-pin SSOP package allows the
tuner to be kept small.
Features
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Supply voltage: 5.0 V (typ.)
Wide input frequency range
Low phase noise oscillator
Standard I
2
C bus format control
4-MHz (X’tal) buffer output pin
Reference oscillator input change-over switch [X’tal or external input]
33-V high-voltage tuning amplifier built-in
3-bit input port (for read mode)
2-bit band switch drive transistor (for write mode)
5-level AD converter
Frequency step: 62.5 kHz or 125 kHz (for 4-MHz X’tal)
4-address setting via address selector
Power-on reset circuit
×1/2 prescaler
Flat compact package: SSOP30-P-300-0.65 (0.65-mm pitch)
Weight: 0.17 g (typ.)
Power-On Reset Operation Conditions
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Frequency step: 125 kHz
Charge pump output current:
±50 mA
Counter data: all [0]
Band driver: OFF
Tuning amplifier: OFF
Note 1: This device can easily be damaged by high voltages or electrical fields. For this reason, please handle it
with care.
1
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TA1296FN
Pin Functions
Pin No.
1
2
Pin Name
GND1
V
CC
1
Function
Ground pin for oscillator circuit block
Power supply pin for local oscillator
circuit block
2
Interface
¾
3
Oscillator
4
Local oscillator circuit
4
3
GND1
5
GND2
Ground pin for oscillator circuit block
V
CC
2
6
Vt Output
6
Tuning voltage output pin with built-in
tuning amplifier
GND3
7
NF
7
V
CC
2
V
CC
2
1 kW
5 kW
5 kW
5 kW
5 kW
50
W
¾
Crystal oscillator input
Reference Input
8
(4-MHz input)
Can be switched between X’tal
oscillator and external input using pin
24 (XO switch).
8
1 kW
GND3
9
V
CC
2
Power supply pin for PLL circuit block
V
CC
2
¾
10
Reference signal
buffer output
Buffer output pin for reference signal
10
GND3
11
GND3
Ground pin for PLL circuit block
¾
3
2002-02-12
TA1296FN
Pin No.
Pin Name
Function
V
CC
2
2 kW
AD converter pin
12
ADC
Converts input voltage into digital
data.
12
Interface
GND3
13
I-P1
V
CC
2
13, 15
15
I-P3
GND3
Comparator status can be checked in
Read Mode.
V
CC
2
14
I-P2
14
GND3
V
CC
2
16
SCL Input
Input pin for I C bus serial clock data
2
16
1 kW
100
W
GND3
V
CC
2
SDA
17
Input/Output
Input/output pin for I C bus serial
clock data
2
17
20
W
1 kW
100
W
GND3
70 kW
4
2002-02-12
TA1296FN
Pin No.
Pin Name
Function
V
CC
2
18
Band 1 Output
18, 19
Output can be controlled by setting
band switch data.
19
Band 2 Output
GND3
20
GND4
Ground pin for IF amplifier circuit
block
¾
V
CC
3
Interface
21
IF Output
IF output pin
21
GND4
22
23
V
CC
3
GND5
Power supply pin for IF amplifier
circuit block
Ground pin for IF amplifier circuit
block
V
CC
2
25 kW
25 kW
GND3
V
CC
2
150 kW
100
W
¾
25
100
W
1 kW
50 kW
GND3
26
GND6
Ground pin for mixer circuit block
Determines reference signal input.
24
XO Switch
If connected to ground:
X’tal oscillator.
If open or connected to V
CC
2:
external input
24
1 kW
¾
¾
25
ADR Set
The address for hardware bit setting
can be selected by applying voltage to
this pin.
4 programmable address can be
programmed.
5
2002-02-12
嵌入式系统
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