Datasheet

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SBAS417B − JUNE 2007 − REVISED JANUARY 2008
www.ti.com
3
ELECTRICAL CHARACTERISTICS: V
S
= +2.7V to +5.5V
At T
A
= −40°C to +85°C, +V
CC
= +2.7V, V
REF
= 2.5V internal voltage, f
SAMPLE
= 125kHz, f
CLK
= 16 • f
SAMPLE
= 2MHz, 12-bit mode, digital
inputs = GND or IOVDD, and +V
CC
must be ≥ IOVDD, unless otherwise noted.
TSC2046E
PARAMETER CONDITION MIN TYP MAX UNITS
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
Resolution 12 Bits
No Missing Codes 11 Bits
Integral Linearity Error ±2 LSB
(1)
Offset Error ±6 LSB
Gain Error External V
REF
±4 LSB
Noise Including Internal V
REF
70 µVrms
Power-Supply Rejection 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
= 2.5V
PP
at 50kHz 100 dB
SWITCH DRIVERS
On-Resistance
Y+, X+ 5 Ω
Y−, X− 6 Ω
Drive Current
(2)
Duration 100ms 50 mA
REFERENCE OUTPUT
Internal Reference Voltage 2.45 2.50 2.55 V
Internal Reference Drift 15 ppm/°C
Quiescent Current 500 µA
REFERENCE INPUT
Range 1.0 +V
CC
V
Input Impedance SER/DFR = 0, PD1 = 0 1 GΩ
Internal Reference Off
Internal Reference On 250 Ω
BATTERY MONITOR
Input Voltage Range 0.5 6.0 V
Input Impedance
Sampling Battery 10 kΩ
Battery Monitor Off 1 GΩ
Accuracy V
BAT
= 0.5V to 5.5V, External V
REF
= 2.5V −2 +2 %
V
BAT
= 0.5V to 5.5V, Internal Reference −3 +3 %
TEMPERATURE MEASUREMENT
Temperature Range −40 +85 °C
Resolution Differential Method
(3)
1.6 °C
TEMP0
(4)
0.3 °C
Accuracy Differential Method
(3)
±2 °C
TEMP0
(4)
±3 °C
(1)
LSB means Least Significant Bit. With V
REF
= +2.5V, 1 LSB is 610µV.
(2)
Assured by design, but not tested. Exceeding 50mA source current may result in device degradation.
(3)
Difference between TEMP0 and TEMP1 measurement, no calibration necessary.
(4)
Temperature drift is −2.1mV/°C.
(5)
TSC2046E operates down to 2.2V.
(6)
IOVDD must be ≤ (+V
CC
).
(7)
Combined supply current from +V
CC
and IOVDD. Typical values obtained from conversions on AUX input with PD0 = 0.