DDC101 Datasheet, PDF (10/29 Pages) Burr-Brown (TI) – 20-BIT ANALOG-TO-DIGITAL CONVERTER

TYPICAL PERFORMANCE CURVES
ELECTRICAL
System Clock = 2MHz, V_S = ±5VDC, V_REF = –2.5V, L = 1 Integration/Conversion, and T_A = +25°C, unless otherwise noted.
SINAD AT 10kHz CONVERSION, UNIPOLAR INPUT
0
100µs Integration Time
K = 16 Acquisition Clocks
20
M = 32 Oversamples
40
–60dB
60
80
0dB
100
0
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Input Frequency (Hz)
SINAD AT 1kHz CONVERSION, UNIPOLAR INPUT
0
1ms Integration Time
K = 16 Acquisition Clocks
20
M = 128 Oversamples
40
–60dB
60
80
100
0
0dB
50 100 150 200 250 300 350 400 450 500
Input Frequency (Hz)
18
16
14
12
10
8
6
4
2
0
0
NOISE vs INPUT LEVEL (UNIPOLAR) WITH CDS
1ms Integration Time
K = 16 Acquisition Clocks
M = 128 Oversamples
C_IN = 500pF
C_IN = 100pF
C_IN = 0pF
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Input Level of FS
NOISE vs INPUT LEVEL (UNIPOLAR) WITHOUT CDS
18
16 ^{CIN = 500pF}
14
C_IN = 100pF
12
10
8
C_IN = 0pF
6
4
1ms Integration Time
M = 128 Oversamples
2
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Input Level of FS
1000
100
NOISE vs RESISTOR VALUE
Low Level, Unipolar Input
K = 16 Acquisition Clocks
1ms Int., M = 128 O/S
10
1
0.01
0.1
100µs Int., M = 16 O/S
1
10
100
1G
R_IN (MΩ)
350
300
250
200
150
100
50
0
–50
0
CHARGE INJECTION vs INPUT CAPACITANCE
No CDS
CDS On, K = 16
100
200
500
C_IN (pF)
1000
®
DDC101
10