ICL7135C Datasheet, PDF (4/11 Pages) Texas Instruments – 4 1/2-DIGIT PRECISION ANALOG-TO-DIGITAL CONVERTERS

ICL7135C, TLC7135C
4 1/2-DIGIT PRECISION
ANALOG-TO-DIGITAL CONVERTERS
SLAS074B – DECEMBER 1986 – REVISED MAY 1999
operating characteristics, V_CC+ = 5 V, V_CC– = 5 V, V_ref = 1 V, f_clock = 120 kHz, T_A = 25°C (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
α_FS Full-scale temperature coefficient (see Note 4)
EL Linearity error
ED Differential linearity error (see Note 5)
EFS ± Full-scale symmetry error (rollover error) (see Note 6)
Display reading with 0-V input
VID = 2 V, 0°C ≤ TA ≤ 70°C
– 2 V ≤ VID ≤ 2 V
– 2 V ≤ VID ≤ 2 V
VID = ± 2 V
VID = 0, 0°C ≤ TA ≤ 70°C
– 0.0000
0.5
0.01
0.5
± 0.0000
5
1
0.0000
ppm/°C
count
LSB
count
Digital
Reading
Display reading in ratiometric operation
VID ₌ Vref, TA = 25°C
0°C ≤ TA ≤ 70°C
0.9998 0.9999 1.0000
0.9995 0.9999 1.0005
NOTES: 4. This parameter is measured with an external reference having a temperature coefficient of less than 0.01 ppm/°C.
5. The magnitude of the difference between the worst case step of adjacent counts and the ideal step.
6. Rollover error is the difference between the absolute values of the conversion for 2 V and – 2 V.
Digital
Reading
timing diagrams
BUSY†
End of Conversion
B1 – B8
D5
D4
D3
D2
D1
D5
STROBE†
200 Counts
D5
201 Counts
200 Counts
D4
200 Counts
D3
200 Counts
D2
200 Counts
D1
200 Counts
† _{Delay between BUSY going low and the first STROBE pulse is dependent upon the analog input.}
Figure 1
4
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