SA578 Datasheet, PDF (4/7 Pages) NXP Semiconductors – Unity gain level programmable low power compandor

Philips Semiconductors
Unity gain level programmable low power compandor
Product specification
SA578
ELECTRICAL CHARACTERISTICS
T_A = 25°C, V_CC = 3.6VDC, compandor 0dB level = –20dBV = 100mV_RMS, output load R_L = 10kΩ, Freq = 1kHz, unless otherwise specified.
R1, R2 and R3 are 1% resistors.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA578
UNITS
MIN
TYP
MAX
V_CC
I_CC
V_REF
R_L
THD
Supply voltage¹
Supply current
operating
power down
Reference voltage²
Summing amp minimum output load
Total harmonic distortion
No signal, R₂ = 100kΩ
V_CC = 3.6V
1kHz, 0dB, BW = 3.5kHz
2
3.6
7
V
1.4
2
mA
170
µA
1.7
1.8
1.9
V
600
Ω
0.25
1.0
%
E_NO Expandor output noise voltage
0dB Unity gain level
BW = 20kHz, R_S = 0Ω
0dB at 1kHz
10
20
µV
–1.0
0.18
1.0
dB
Programmable range³
R1 = R3 = 18.7kΩ, R2 = 24.3kΩ
0
R1 = R3 = 22.6kΩ, R2 = 100kΩ
–10
dBV
R1 = R3 = 7.15kΩ, R2 = 100kΩ
–20
R1 = R3 = 1.33kΩ, R2 = 200kΩ
–40
V_OS Output voltage offset
Expandor output DC shift
No signal
No signal to 0dB
–150
1
150
mV
–100
7
100
mV
Tracking error relative to 0dB output
-20dB expandor
–1.0
0.3
1.0
dB
Crosstalk, COMP to EXP
Output swing low
V_O
Output swing high
Power Down/Mute low level
1kHz, 0dB, C_REF = 10µF
–80
–65
dB
0.2
V
V_CC – 0.2
0
0.4
V
Power Down/Mute input current
Pin 8 grounded
–65
µA
NOTE:
1. Operation down to V_CC = 1.8V is possible.
2. Reference voltage, V_REF, is typically at 1/2 V_CC.
3. Unity gain level can be adjusted CONTINUOUSLY between –40dBV = 10mV_RMS and 0dBV = 1.0V_RMS. For details see application note
AN1762.
1997 Nov 07
4