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TDA9901TS Datasheet PDF : 18 Pages
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NXP Semiconductors
TDA9901
Wideband differential digital controlled variable gain amplifier
Table 3.
Symbol
VDDD
GRAY2
GRAY1
Pin description …continued
Pin
Description
18
digital supply voltage
19
digital control signal bit 2 input (Most Significant Bit (MSB))
20
digital control signal bit 1 input
8. 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.
9. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min
VDDA
VDDD
∆VDD
VI
IO
Tstg
Tamb
analog supply voltage
digital supply voltage
supply voltage difference
input voltage
output current
storage temperature
ambient temperature
VDDA − VDDD
−0.3
−0.3
−0.1
−0.3
-
−55
−40
Tj
junction temperature
-
Max
Unit
+7.0
V
+7.0
V
+4.0
V
+7.0
V
10
mA
+150
°C
+85
°C
150
°C
10. Thermal characteristics
Table 5.
Symbol
Rth(j-a)
Thermal characteristics
Parameter
thermal resistance from junction to
ambient
Conditions
in free air
Value Unit
120
K/W
TDA9901_4
Product data sheet
Rev. 04 — 14 August 2008
© NXP B.V. 2008. All rights reserved.
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