SPECIFICATION: +2.7V
At TA = –40°C to +85°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted.
ADS7844E, N
TYP
ADS7844EB, NB
PARAMETER
CONDITIONS
MIN
MAX
MIN
TYP
MAX
UNITS
ANALOG INPUT
Full-Scale Input Span
Absolute Input Range
Positive Input - Negative Input
Positive Input
0
–0.2
–0.2
VREF
+VCC +0.2
+0.2
✻
✻
✻
✻
✻
✻
V
V
V
Negative Input
Capacitance
Leakage Current
25
±1
✻
✻
pF
µA
SYSTEM PERFORMANCE
Resolution
No Missing Codes
Integral Linearity Error
Differential Linearity Error
Offset Error
Offset Error Match
Gain Error
Gain Error Match
Noise
12
✻
Bits
Bits
12
✻
±2
±1
±1
✻
✻
±3
✻
LSB(1)
LSB
LSB
LSB
LSB
LSB
µVrms
dB
±0.8
±0.5
±3
1.0
±4
0.15
✻
0.1
30
70
1.0
✻
✻
✻
Power Supply Rejection
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
12
✻
✻
Clk Cycles
Clk Cycles
3
✻
125
kHz
ns
ns
500
30
100
✻
✻
✻
Aperture Jitter
ps
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion(2)
Signal-to-(Noise + Distortion)
Spurious Free Dynamic Range
Channel-to-Channel Isolation
VIN = 2.5Vp-p at 10kHz
VIN = 2.5Vp-p at 10kHz
VIN = 2.5Vp-p at 10kHz
VIN = 2.5Vp-p at 50kHz
–75
71
78
–77
72
80
✻
dB
dB
dB
dB
100
REFERENCE INPUT
Range
Resistance
0.1
+VCC
40
✻
✻
✻
✻
V
DCLK Static
5
13
2.5
✻
✻
✻
✻
GΩ
µA
µA
µA
Input Current
fSAMPLE = 12.5kHz
DCLK Static
0.001
3
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels
VIH
VIL
VOH
CMOS
✻
| IIH | ≤ +5µA
| IIL | ≤ +5µA
IOH = –250µA
IOL = 250µA
+VCC • 0.7
–0.3
+VCC • 0.8
5.5
+0.8
✻
✻
✻
✻
✻
V
V
V
V
VOL
0.4
✻
Data Format
Straight Binary
✻
POWER SUPPLY REQUIREMENTS
+VCC
Quiescent Current
Specified Performance
2.7
3.6
650
✻
✻
✻
V
280
220
✻
✻
µA
µA
µA
mW
fSAMPLE = 12.5kHz
Power-Down Mode(3), CS = +VCC
3
1.8
✻
✻
Power Dissipation
TEMPERATURE RANGE
Specified Performance
–40
+85
✻
✻
°C
✻ Same specifications as ADS7844E, ADS7844N.
NOTE: (1) LSB means Least Significant Bit. With VREF equal to +2.5V, one LSB is 610mV. (2) First five harmonics of the test frequency. (3) Auto power-down mode
(PD1 = PD0 = 0) active or SHDN = GND.
®
ADS7844
3
BB [ BURR-BROWN CORPORATION ]
