Datasheet

6
LTC1968
1968f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Bandwidth to 500kHz
DC Transfer Function Near Zero
Input Common Mode Rejection
Ratio vs Frequency
Output Accuracy
vs Signal Amplitude
Output Noise vs Input Frequency
INPUT FREQUENCY (kHz)
0
199
200
202
400
1968 G14
198
197
100 200 300 500
196
195
201
OUTPUT VOLTAGE (mV)
0.5%/DIV
C
AVE
= 10µF
V
IN
= 200mV
RMS
V
IN1
(mV DC)
–30
–10
V
OUT
(mV DC)
0
10
20
–20
–10
010
1968 G15
20
30
40
–5
5
15
25
35
30
V
IN2
= MIDSUPPLY
THREE REPRESENTATIVE UNITS
INPUT FREQUENCY (Hz)
10
0
INPUT CMRR (dB)
20
40
60
100
1k
10k 100k
1967 G16
1M
80
10
30
50
70
90
10M
4.5V COMMON
MODE INPUT
CONVERSION
TO DC OUTPUT
V
IN1
(V
RMS
)
0
–20
{V
OUT
(mV DC) – V
IN
(mV
RMS
)} (mV)
–15
–10
–5
0
5
10
0.5 1 1.5
DC
2
1967 G17
1% ERROR
V
IN2
= MIDSUPPLY
–1% ERROR
AC – 60Hz
SINEWAVE
INPUT FREQUENCY (Hz)
10k
0.001
PEAK OUTPUT NOISE (% OF READING)
0.01
0.1
1
100k 1M
1967 G18
PEAK NOISE MEASURED
IN 10 SECOND PERIOD
C
AVE
= 1µF
C
AVE
= 100µF
C
AVE
= 10µF
Output Noise vs Device
INPUT FREQUENCY (Hz)
1k
0.01
PEAK OUTPUT NOISE (% OF READING)
0.1
1
10k 100k 1M
1968 G19
LTC1966
C
AVE
= 1µF
LTC1967
C
AVE
= 1.5µF
LTC1968
C
AVE
= 6.8µF
AVE CAPACITOR CHOSEN FOR EACH DEVICE
TO GIVE A 1 SECOND, 0.1% SETTLING TIME