Datasheet

6
LTC1821
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SUPPLY VOLTAGE (V)
–1.0
DIFFERENTIAL NONLINEARITY (LSB)
–0.8
–0.4
–0.2
0
1.0
0.4
2
4
5
1821 G16
–0.6
0.6
0.8
0.2
3
6
7
V
REF
= 10V
V
REF
= 2.5V
V
REF
= 10V
V
REF
= 2.5V
SUPPLY VOLTAGE (V)
–1.0
DIFFERENTIAL NONLINEARITY (LSB)
–0.8
–0.4
–0.2
0
1.0
0.4
2
4
5
1821 G17
–0.6
0.6
0.8
0.2
3
6
7
V
REF
= 10V
V
REF
= 10V
V
REF
= 2.5V
V
REF
= 2.5V
Differential Nonlinearity vs V
CC
Supply Voltage in Unipolar Mode
Differential Nonlinearity vs V
CC
Supply Voltage in Bipolar Mode
Unipolar Multiplying Mode Frequency
Response vs Digital Code
Bipolar Multiplying Mode Frequency
Response vs Digital Code
Bipolar Multiplying Mode Frequency
Response vs Digital Code
FREQUENCY (Hz)
–100
–120
ATTENUATION (dB)
–80
–40
0
100 10k 100k 10M
1821 G18
1k 1M
–20
–60
D15 ON
D14 ON
D13 ON
D12 ON
ALL BITS ON
D9 ON
D1 ON
D0 ON
D11 ON
D10 ON
D8 ON
D7 ON
D6 ON
D5 ON
D4 ON
D3 ON
D2 ON
ALL BITS OFF
30pF
8 9 10 11
14
13
11617
12
LTC1821
V
OUT
V
REF
FREQUENCY (Hz)
–100
ATTENUATION (dB)
–80
–40
0
10
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO –96dB TYPICAL (–78dB MAX, A GRADE)
1k 10k 10M1M
1821 G19
100 100k
–20
–60
D15 AND D14 ON
D15 AND D13 ON
D15 AND D12 ON
D15 AND D11 ON
D15 AND D10 ON
D15 AND D9 ON
D15 AND D8 ON
D15 AND D7 ON
D15 AND D6 ON
D15 AND D5 ON
D15 AND D4 ON
D15 AND D3 ON
D15 AND D2 ON
ALL BITS ON
D15 ON
*
D15 AND D0 ON
D15 AND D1 ON
CODES FROM
MIDSCALE
TO FULL SCALE
15pF
12pF
–
+
12pF
V
REF
V
OUT
8910 11
14
13
17161
12
LT1468
LTC1821
2
3
6
FREQUENCY (Hz)
–100
ATTENUATION (dB)
–80
–40
0
10 1k 10k 10M1M
1821 G20
100 100k
–20
–60
D14 ON
D14 AND D13 ON
D14 TO D12 ON
D14 TO D11 ON
D14 TO D10 ON
D14 TO D9 ON
D14 TO D8 ON
D14 TO D7 ON
D14 TO D6 ON
D14 TO D5 ON
D14 TO D4 ON
D14 TO D3 ON
D14 TO D2 ON
D14 TO D1 ON
ALL BITS OFF
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO –96dB TYPICAL (–78dB MAX, A GRADE)
D14 TO D0 ON
D15 ON
*
CODES FROM
MIDSCALE
TO ZERO SCALE
15pF
12pF
–
+
12pF
V
REF
V
OUT
8910 11
14
13
17161
12
LT1468
LTC1821
2
3
6