TDA9901TS Просмотр технического описания (PDF) - Philips Electronics

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TDA9901TS

Wideband differential digital controlled variable gain amplifier

Philips Electronics 

Philips Semiconductors

Wideband differential digital controlled

variable gain amplifier

Product specification

TDA9901

PINNING

SYMBOL PIN

DESCRIPTION

GRAY0

1 digital control signal bit 0 input

(LSB)

TE

2 transparent enable input

CLK

3 clock input for gain control setting

CLKN

4 inverting clock input for gain

control setting (active low)

CMVGA

5 regulator output common mode

VGA input

IN

6 non-inverting analog input

INN

7 inverting analog input (active low)

n.c.

8 not connected

n.c.

9 not connected

n.c.

10 not connected

VDDA

VSSA

n.c.

11 analog supply voltage

12 analog ground

13 not connected

OUTN

14 inverting analog output (active low)

OUT

15 non-inverting analog output

CMADC

16 regulator output common mode

ADC input

VSSD

VDDD

GRAY2

17 digital ground

18 digital supply voltage

19 digital control signal bit 2 input

(MSB)

GRAY1

20 digital control signal bit 1 input

handbook, halfpage

GRAY0 1

20 GRAY1

TE 2

CLK 3

CLKN 4

19 GRAY2

18 VDDD

17 VSSD

CMVGA 5

16 CMADC

TDA9901TS

IN 6

15 OUT

INN 7

14 OUTN

n.c. 8

13 n.c.

n.c. 9

n.c. 10

12 VSSA

11 VDDA

MGM963

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA9901 provides a digitally controlled variable gain function for high-frequency applications.

The TDA9901 can be operated in two different modes, depending on the value at pin TE. When TE is at logic 1, the gain

can be instantly controlled when the clock signal is HIGH (transparent mode). The gain is fixed during the LOW period

of the clock. When TE is at logic 0 the gain of the TDA9901 is changed at the rising edge of the clock signal.

1999 Oct 08

4

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