SPECIFICATIONS
At TA = –40°C to +85°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, and digital inputs = GND or +VCC, unless
otherwise noted.
ADS7845E
PARAMETER
RESOLUTION
CONDITIONS
MIN
TYP
MAX
UNITS
12
Bits
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
0.1
pF
µA
SYSTEM PERFORMANCE
No Missing Codes
Integral Linearity Error
Offset Error
11
Bits
LSB(1)
LSB
±2
±6
±4
Gain Error
LSB
Noise
30
70
µVrms
dB
Power Supply Rejection Ratio
SAMPLING DYNAMICS
Conversion Time
12
Clk Cycles
Acquisition Time
3
Clk Cycles
Throughput Rate
Multiplexer Settling Time
Aperture Delay
125
kHz
ns
ns
500
30
Aperture Jitter
Channel-to-Channel Isolation
100
100
ps
dB
VIN = 2.5Vp-p at 50kHz
SWITCH DRIVERS
On-Resistance
UL, UR
7
7
Ω
Ω
LL, LR
REFERENCE INPUT
Range
Resistance
1.0
+VCC
40
V
CS = GND or +VCC
5
13
2.5
GΩ
µA
µA
µA
Input Current
fSAMPLE = 12.5kHz
CS = +VCC
0.001
3
DIGITAL INPUT/OUTPUT
Logic Family
CMOS
Logic Levels, Except PENIRQ
VIH
VIL
VOH
VOL
| IIH | ≤ +5µA
| IIL | ≤ +5µA
IOH = –250µA
IOL = 250µA
+VCC • 0.7
–0.3
+VCC • 0.8
+VCC +0.3
+0.8
V
V
V
0.4
0.8
PENIRQ
VOL
TA = 0°C to +85°C, 100kΩ Pull-Up
V
Data Format
Straight Binary
POWER SUPPLY REQUIREMENTS
+VCC
Specified Performance(2)
2.7
5.5
V
Quiescent Current
280
220
650
µA
µA
µA
fSAMPLE = 12.5kHz
Shutdown Mode with
DCLK = DIN = +VCC
+VCC = +2.7V
3
Power Dissipation
1.8
mW
TEMPERATURE RANGE
Specified Performance
–40
+85
°C
NOTE: (1) LSB means Least Significant Bit. With VREF equal to +2.5V, one LSB is 610µV. (2) ADS7845 will operate down to 2.0V.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
ADS7845
2
BB [ BURR-BROWN CORPORATION ]
