Datasheet

ADS1293
www.ti.com SNAS602B –FEBRUARY 2013–REVISED MARCH 2013
ELECTRICAL CHARACTERISTICS
(1)
(continued)
Unless otherwise noted, all limits are specified at T
A
= +25°C, +2.7V ≤ VDD ≤ +5.5V, +1.65V ≤ VDDIO ≤ MIN(+3.6V, VDD),
VREF = +2.4V, f
OSC
= 409.6kHz, 1µF low ESR capacitor between CVREF and GND, 0.1µF capacitor between RLDREF and
GND. Boldface limits apply for T
MIN
≤ T
A
≤ T
MAX
.
PARAMETER TEST CONDITIONS MIN
(2)
TYP
(3)
MAX
(2)
UNIT
RIGHT LEG DRIVE AMPLIFIER (RLD Amp)
V
OS
Input-Referred Offset Voltage ±5 mV
CMVR Common-Mode Voltage Range 0.5 VDD – 0.5 V
Low bandwidth mode 50 kHz
GBW Programmable Gain Bandwidth
High bandwidth mode 200 kHz
Low bandwidth mode 25 mV/μs
SR Slew Rate
High bandwidth mode 90 mV/μs
High bandwidth, Low cap-drive mode (see Table 11) 400 pF
Programmable Capacitive Load Driving
Cl
MAX
Capability
Low bandwidth, High cap-drive mode (see Table 11) 8 nF
Low bandwidth, Low cap-drive mode 20 36 μA
IVDD Quiescent Power Consumption
High bandwidth, High cap-drive mode 60 91 μA
RIGHT LEG DRIVE REFERENCE
(VDD –
RLD
REF
Output Voltage Unloaded V
VSS)/2.2
COMMON-MODE DETECTOR AMPLIFIER (CMDET Amp)
CMVR Common-Mode Voltage Range 0.5 VDD – 0.5 V
Low bandwidth mode 50 kHz
BW Programmable Bandwidth
High bandwidth mode 150 kHz
Low bandwidth mode 25 mV/μs
SR Slew Rate
High bandwidth mode 90 mV/μs
High bandwidth mode, Low capdrive mode (see
400 pF
Table 10)
Programmable Capacitive Load Driving
Cl
MAX
Capability
Low bandwidth mode, High cap- drive mode (see
8 nF
Table 10)
N leads, low bandwidth mode, low cap-drive mode 21 + 3 × N μA
IVDD Power Consumption (Selected Leads)
N leads, high bandwidth mode, high cap-drive mode 61 + 3 × N μA
WILSON REFERENCE CIRCUIT
IVR Input Voltage Range 0.5 VDD – 0.5 V
BW Bandwidth 3 buffers ON 50 kHz
SR Slew Rate 3 buffers ON 45 mV/μs
N
e
Noise Density At 10Hz 60 nV/√Hz
Input-Referred Noise for Wilson
V
e
0.1 - 200Hz, 3 buffers ON 5.5 μV
PP
Reference Amp
IVDD Power Consumption (Selected Leads) N leads, low power mode 7 × N μA
LEAD OFF DETECTION
Programmable: Min. code 0x01
8 nA
(See Lead-Off Detection (LOD))
IEXC Excitation Current
Programmable: Max. code 0xFF
2040 nA
(See Lead-Off Detection (LOD))
IEXC
TOL
Excitation Current Accuracy 25%
AC LOD mode, programmable, minimum
6.1 Hz
(see Analog AC Lead-Off Detect )
FEXC Excitation Frequency
AC LOD mode, programmable, maximum
12.5 kHz
(see Analog AC Lead-Off Detect)
VTH
DC
DC Lead Off Comparator Threshold VDD – 0.5 V
V
HYST
Comparator Hysteresis DC lead off mode 55 mV
IVDD Current Consumption Programmed excl. excitation current 25 μA
Copyright © 2013, Texas Instruments Incorporated 7
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