Datasheet

DS4420
I
2
C Programmable-Gain Amplifier
for Audio Applications
4 _____________________________________________________________________
Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Note 2: Standby supply current specified with SDA = SCL = V
CC
, the output disconnected, and A0, A1, and A2 driven to within
100mV of V
CC
or GND.
Note 3: Input resistance during mute and power-down is approximately one-half of the active-mode resistance.
Note 4: Each output is capable of driving a 100nF capacitive load to ground using an external 10Ω series resistor. However, output
capacitance should be minimal for optimal distortion performance.
Note 5: Guaranteed by design.
Note 6: This is the time it takes for the output to become active after exiting standby mode.
Note 7: I
2
C interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I
2
C standard-
mode timing.
Note 8: C
B
= total capacitance of one bus line in picofarads.
Note 9: The current specified is the sum of V
CC
and AV
CC
supply currents.
Note 10: Gain accuracy specified assuming the output impedance of signal source driving of the DS4420 is ≤ 2.5kΩ.
Typical Operating Characteristics
(T
A
= +25°C, V
CC
= AV
CC
= 5.0V, unless otherwise noted.)
70
74
72
78
76
82
80
84
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(STANDBY MODE ENABLED)
DS4420 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
4.50 4.75 5.00 5.25 5.50
V
CC
= AV
CC
= SDA = SCL
NO LOAD
IN+ AND IN- SHORTED
TOGETHER
+25°C
+70°C
-20°C
1.8
1.7
1.6
1.5
1.4
4.50 5.004.75 5.25 5.50
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(SETTING AT -11dB)
DS4420 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
V
CC
= AV
CC
= SDA = SCL
NO LOAD
IN+ AND IN- SHORTED
TOGETHER
+25°C
-20°C
+70°C
0
0.6
0.4
0.2
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 5 10 15 20
SUPPLY CURRENT vs. GAIN SETTING
DS4420 toc03
GAIN SETTING
SUPPLY CURRENT (mA)
IN+ AND IN- SHORTED
TOGETHER
NO LOAD