DDC101 Datasheet, PDF (4/29 Pages) Burr-Brown (TI) – 20-BIT ANALOG-TO-DIGITAL CONVERTER

SECTION 2
SPECIFICATIONS
ELECTRICAL
All specifications with unipolar current input range, T_INT = 1ms, correlated double sampling enabled, System Clock = 2MHz, V_REF = –2.5V, T_A = +25°C and V_S = ±5VDC,
unless otherwise noted.
DDC101
PARAMETER
CONDITIONS
INPUTS
Charge Input⁽⁶⁾
Unipolar Input Range
Bipolar Input Range
Input Current
Current Input Range Examples⁽¹⁰⁾
Unipolar Input Range
Unipolar Input Range
Bipolar Input Range
Bipolar Input Range
Voltage Input Examples⁽¹⁰⁾
Unipolar Input Range⁽²⁾
Bipolar Input Range⁽²⁾
DYNAMIC CHARACTERISTICS
Conversion Time
Integration Time
System Clock Input
BTC Output Code
BTC Output Code
Unipolar or Bipolar Range
T
INT
=
100µs
T_INT = 1ms
T_INT = 100µs
T_INT = 1ms
R
IN
=
10MΩ,
T
INT
=
1ms
R_IN = 10MΩ, T_INT = 1ms
ACCURACY
Unipolar Mode Noise
Noise, Low Level Current Input⁽¹⁾
Noise, Low Level Current Input⁽¹⁾
Noise, Low Level Current Input⁽¹⁾
Noise, Low Level Current Input⁽¹⁾
Noise, Voltage Input^{(1, 2)}
Differential Linearity Error
Unipolar Input Range
Unipolar or Bipolar Input Range
Integral Linearity Error
Unipolar Input Range⁽¹¹⁾
Unipolar or Bipolar Input Range⁽¹¹⁾
No Missing Codes
Unipolar Input Range
Bipolar Input Range
Input Bias Current
DC Gain Error
Output Offset Error⁽⁸⁾
Input Offset Voltage⁽⁸⁾
External Voltage Reference, V_REF
Internal Test Signal
Internal Test Signal Accuracy
Gain Sensitivity to V_REF
PSRR
C_SENSOR = 0pF, L = 8
C_SENSOR = 0pF, L = 1
C
= 100pF, L = 1
SENSOR
C_SENSOR = 500pF, L = 1
R_IN ≥ 20MΩ
Entire Range
0.1% FSR Input
1% FSR Input
10% FSR Input
0 to 500 pc/Integration
–1.95 to 0 pc/Integration
0.1% FSR Input
1% FSR Input
10% FSR Input
T
A
=
+25°C
V_REF = 2.5V ±0.1V
PERFORMANCE OVER TEMPERATURE
Output Offset Drift⁽⁸⁾
not including bias current drift
Input Offset Voltage Drift⁽⁸⁾
Input Bias Current Drift
+25°C to +45°C
Input Bias Current
Gain Drift⁽⁴⁾
T
A
=
+85°C
DIGITAL INPUT/OUTPUT
Logic Family
Logic Level: V_IH
V_IL
V_OH
V
OL
Data Clock
Data I/O
SETUP Code I/O⁽⁹⁾
Data Format
Straight Binary
Two’s Complement
I_IH = +5µA
I_IL = +5µA
I_OH = 2 TTL Loads
I = 2 TTL Loads
OL
Unipolar or Bipolar Range
Unipolar or Bipolar Range
®
DDC101
MIN
TYP
MAX
UNITS
–1.95
–251.95
–0.0195
–1.95
–2.5195
–251.95
–0.0195
–2.5195
64
64
0.5
500
250
7.8
5
500
2.5
250
5
2.5
256 x 10⁶
10⁶
2
pC/Integration
pC/Integration
µA
µA
nA
µA
nA
V
V
µs
µs
MHz
80
+2.0
–0.3
+2.4
0.0
4
0.9
ppm of FSR, rms⁽³⁾
1.6
ppm of FSR, rms
2.1
3
ppm of FSR, rms
4.2
ppm of FSR, rms
1.9
ppm of FSR, rms
±0.005% Reading ±0.5ppm FSR, max
±0.00006
% of FSR
±0.00010
% of FSR
±0.00055
% of FSR
±0.0015
% of FSR
±0.0244% Reading ±2.5ppm FSR, max
±0.0244% Reading ±3.0ppm FSR, max
±0.00028
% of FSR
±0.00050
% of FSR
±0.0027
% of FSR
±0.003
% of FSR
18
Bits
16
Bits
3
10
pA
±0.5
±2
% of FSR
±0.5
ppm of FSR
±0.5
±2
mV
–2.5
VDC
100
nA
±20
nA
1:1
90
dB
0
µV/°C
1
µV/°C
0.1
0.5
pA/°C
8
40
pA
±15
ppm/°C
TTL Compatible CMOS
20
21
+V_CC
+0.8
+V_CC
0.4
8
4
V
V
V
V
MHz
MHz
Bits
Bits