Datasheet

®
2
ADS7845
PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 12 Bits
ANALOG INPUT
Full-Scale Input Span Positive Input - Negative Input 0 V
REF
V
Absolute Input Range Positive Input –0.2 +V
CC
+0.2 V
Negative Input –0.2 +0.2 V
Capacitance 25 pF
Leakage Current 0.1 µA
SYSTEM PERFORMANCE
No Missing Codes 11 Bits
Integral Linearity Error ±2 LSB
(1)
Offset Error ±6 LSB
Gain Error ±4 LSB
Noise 30 µVrms
Power Supply Rejection Ratio 70 dB
SAMPLING DYNAMICS
Conversion Time 12 Clk Cycles
Acquisition Time 3 Clk Cycles
Throughput Rate 125 kHz
Multiplexer Settling Time 500 ns
Aperture Delay 30 ns
Aperture Jitter 100 ps
Channel-to-Channel Isolation V
IN
= 2.5Vp-p at 50kHz 100 dB
SWITCH DRIVERS
On-Resistance
UL, UR 7 Ω
LL, LR 7 Ω
REFERENCE INPUT
Range 1.0 +V
CC
V
Resistance CS = GND or +V
CC
5GΩ
Input Current 13 40 µA
f
SAMPLE
= 12.5kHz 2.5 µA
CS = +V
CC
0.001 3 µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS
Logic Levels, Except PENIRQ
V
IH
| I
IH
| ≤ +5µA+V
CC
• 0.7 +V
CC
+0.3
V
IL
| I
IL
| ≤ +5µA –0.3 +0.8 V
V
OH
I
OH
= –250µA+V
CC
• 0.8 V
V
OL
I
OL
= 250µA 0.4 V
PENIRQ
V
OL
T
A
= 0°C to +85°C, 100kΩ Pull-Up 0.8 V
Data Format Straight Binary
POWER SUPPLY REQUIREMENTS
+V
CC
Specified Performance
(2)
2.7 5.5 V
Quiescent Current 280 650 µA
f
SAMPLE
= 12.5kHz 220 µA
Shutdown Mode with 3 µA
DCLK = DIN = +V
CC
Power Dissipation +V
CC
= +2.7V 1.8 mW
TEMPERATURE RANGE
Specified Performance –40 +85 °C
SPECIFICATIONS
At T
A
= –40°C to +85°C, +V
CC
= +2.7V, V
REF
= +2.5V, f
SAMPLE
= 125kHz, f
CLK
= 16 • f
SAMPLE
= 2MHz, 12-bit mode, and digital inputs = GND or +V
CC
, unless
otherwise noted.
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.
ADS7845E
NOTE: (1) LSB means Least Significant Bit. With V
REF
equal to +2.5V, one LSB is 610µV. (2) ADS7845 will operate down to 2.0V.