Philips tda9901 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA9901

Wideband differential digital
controlled variable gain amplifier

Product specification
Supersedes data of 1998 Apr 15
File under Integrated Circuits, IC02

1999 Oct 08

Philips Semiconductors Product specification

Wideband differential digital controlled
variable gain amplifier

FEATURES

• 130 MHz, −3 dB small signal bandwidth

• Digitally controlled gain

• TTL/CMOS compatible digital inputs (3.3 or 5 V)

• TTL single ended or differential clock input with PECL

compatibility

• 24 dB gain control range

• Five steps of 6 dB plus 6 dB fixed gain

• 30 dB gain maximum

• High impedance differential inputs

• Low impedance differential outputs

• High power supply rejection

• 125 nV/√Hz output voltage noise density at 30 dB gain

• Fast gain settling

• Dual control modes: transparent or latched.

TDA9901

GENERAL DESCRIPTION

The TDA9901 is a wideband, low noise amplifier with
differential inputs andoutputs. TheTDA9901 incorporates
an AGC function with digital control. The TDA9901 is
optimized for fast switching between different gain
settings, preserving small phase and amplitude error.

The TDA9901 presents an excellent combination of low
noise and good linearity for a wide input frequency range.

The TDA9901 is optimized for processing IF signals in
GSM base stations. It is also suited for many other
applications as a general purpose digitally controlled
variable gain amplifier.

The TDA9901 is able to operate from 4.75 to 5.25 V
supply for the analog part and from 3.0 to 5.25 V for the
digital part.

APPLICATIONS

• Linear AGC systems

• IF amplifierin IF conversion systems (e.g. base stations

or satellite receivers)

• Instrumentation

• Multi-purpose amplifier

• Driver for differential ADCs (e.g. TDA8768).

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V
V
I

DDA

I

DDD

G

DDA
DDD

dif

analog supply voltage 4.75 5.0 5.25 V
digital supply voltage 3.0 3.3 5.25 V
analog supply current − 30 36 mA
digital supply current − 3.0 5.0 mA
differential gain minimum gain 5.7 6.11 6.46 dB

maximum gain 29.3 30.5 31.5 dB

B

P

−3dB

tot

−3 dB small signal bandwidth V

o(dif)(p-p)

T

amb

= 0.125 V;

=25°C

110 130 − MHz

total power dissipation − 160 216 mW

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA9901TS SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1

1999 Oct 08 2

Philips Semiconductors Product specification

Wideband differential digital controlled
variable gain amplifier

BLOCK DIAGRAM

handbook, full pagewidth

INN

CMVGA

V

DDD

6

IN

7

TE

18

2

REFERENCE
GENERATOR

V

DDA

GRAY2

11

GRAY1

19

DECODER

LATCHES

0, 6, 12, 18 or 24 dB

GRAY0

20

8, 9, 10, 13

n.c.

CLK3CLKN

1

REFERENCE
GENERATOR

4

TDA9901

6 dB

12

V

SSA

V

SSD

17

MGM962

TDA9901

15

OUT

14

OUTN

165

CMADC

Fig.1 Block diagram.

1999 Oct 08 3

Philips Semiconductors Product specification

Wideband differential digital controlled
variable gain amplifier

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
V

DDA

V

SSA

n.c. 13 not connected
OUTN 14 inverting analog output (active low)
OUT 15 non-inverting analog output
CMADC 16 regulator output common mode

V

SSD

V

DDD

GRAY2 19 digital control signal bit 2 input

GRAY1 20 digital control signal bit 1 input

11 analog supply voltage
12 analog ground

ADC input

17 digital ground
18 digital supply voltage

(MSB)

handbook, halfpage

GRAY0

CMVGA

TE

CLK

CLKN

INN

n.c.
n.c.
n.c.

IN

10

1
2
3
4
5

TDA9901TS

6
7
8
9

MGM963

Fig.2 Pin configuration.

TDA9901

GRAY1

20
19

GRAY2
V

18

DDD

V

17

SSD

16

CMADC
OUT

15

OUTN

14

n.c.

13

V

12

SSA

V

11

DDA

FUNCTIONAL DESCRIPTION

The TDA9901 provides a digitally controlled variable gain function for high-frequency applications.
The TDA9901 can beoperated in two different modes, depending onthe 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

Philips Semiconductors Product specification

Wideband differential digital controlled

TDA9901

variable gain amplifier

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER MIN. MAX. UNIT

V

DDA

V

DDD

∆V

DD

V

I

I

O

T

stg

T

amb

T

j

HANDLING

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.

analog supply voltage −0.3 +7.0 V
digital supply voltage −0.3 +7.0 V
supply voltage difference between V

DDA

and V

DDD

−1.0 +4.0 V
input voltage level −0.3 +7.0 V
output current − 10 mA
storage temperature −55 +150 °C
ambient temperature −40 +85 °C
junction temperature − 150 °C

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

thermal resistance from junction to ambient in free air 120 K/W

CHARACTERISTICS

V

DDA=V11

T

amb

to V12= 4.75 to 5.25 V; V

DDD=V18

to V17= 3.0 to 5.25 V; V

= −40 to +85 °C; typical values measured at V

DDA

= 5.0 V; V

SSA

= 3.3 V and T

DDD

and V

shorted together;

SSD

=25°C; unless otherwise

amb

specified; note 1.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

V
V
∆V

I

DDA

I

DDD

DDA
DDD

DD

analog supply voltage 4.75 5.0 5.25 V
digital supply voltage 3.0 3.3 5.25 V
voltage difference

between V

DDA

and V

DDD

−0.2 − +2.5 V

analog supply current − 30 36 mA
digital supply current − 3.0 5.0 mA

Variable gain amplifier transfer characteristics

B

t

−3dB

d(g)

−3 dB small signal
bandwidth

V

o(dif)(p-p)

T

amb

= 0.125 V;

=25°C

group delay time up to fi= 20 MHz;

110 130 − MHz

− 2.5 − ns
minimum gain;
T

=25°C

amb

∆t

d(g)

group delay difference 6 dB gain step;

T

=25°C

amb

−−300 ps

1999 Oct 08 5

Philips Semiconductors Product specification

Wideband differential digital controlled

TDA9901

variable gain amplifier

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

t

st

G

step

G

(min)

G

(max)

∆G/∆T gain stability as a function

|∆G/∆VDD| gainstability as a function

∆V

i(offset)

F noise figure R

V

n(o)(eq)

PSRR

(VDDA)

PSRR

(VDDD)

CMRR common mode rejection

settling time 10 to 90% maximum

output transition;
C

L(max)

= 5 pF on
each output;
T

=25°C

amb

gain step size DC input

T

=25°C 5.88 6.09 6.28 dB

amb

all temperatures 5.6 6.09 6.56 dB

minimum gain setting DC input

T

=25°C 5.76 6.11 6.40 dB

amb

all temperatures 5.7 6.11 6.46 dB

maximum gain setting DC input

T

=25°C 29.9 30.5 30.9 dB

amb

all temperatures 29.3 30.5 31.5 dB

minimum gain −−1.0 − mdB/°C

of temperature

maximum gain −−7.5 − mdB/°C
minimum gain − 15 25 mdB/V

of power supply
input offset voltage

6 dB gain step − 0.8 − mV

difference

= 100 Ω;

s

fi= 20 MHz

minimum gain − 29.1 − dB
maximum gain − 9.9 − dB

equivalent output noise
voltage spectral density

Rs= 100 Ω;
fi= 20 MHz;
T

=25°C

amb

G=6dB − 75 − nV/√Hz
G = 12 dB − 82 − nV/√Hz
G = 18 dB − 97 − nV/√Hz
G = 24 dB − 91 − nV/√Hz
G = 30 dB − 124 − nV/√Hz

power supply ripple
rejection of V

DDA

minimum gain

0to20MHz − 57 − dB
20 to 100 MHz − 39 − dB

power supply ripple
rejection of V

DDD

minimum gain dB

0to20MHz − 67 − dB
20 to 100 MHz − 51 − dB

0to20MHz − 75 − dB

ratio

20 to 150 MHz − 45 − dB

−−3.6 ns

1999 Oct 08 6