TLC32046CFN Datasheet, PDF (25/56 Pages) Texas Instruments – Wide-Band Analog Interface Circuit

TLC32046
VCC +
5V
RESET
VCC –
200 kΩ
0.5 µF
–5V
Figure 2–3. Reset on Power-Up Circuit
2.17 Power-Up Sequence
To ensure proper operation of the AIC and as a safeguard against latch-up, it is recommended that Schottky
diodes with forward voltages less than or equal to 0.4 V be connected from V_{CC –} to ANLG GND and from
V_{CC –} to DGTL GND. In the absence of such diodes, power is applied in the following sequence: ANLG GND
and DGTL GND, V_{CC –}, then V_CC+ and V_DD. Also, no input signal is applied until after power-up.
2.18 AIC Register Constraints
The following constraints are placed on the contents of the AIC registers:
1. TA register must be ≥ 4 in word mode (WORD/BYTE= high).
2. TA register must be ≥ 5 in byte mode (WORD/BYTE= low).
3. TA′ register can be either positive, negative, or zero.
4. RA register must be ≥ 4 in word mode (WORD/BYTE = high).
5. RA register must be ≥ 5 in byte mode (WORD/BYTE = low).
6. RA′ register can be either positive, negative, or zero.
7. (TA register ± TA′ register) must be > 1.
8. (RA register ± RA′ register) must be > 1.
9. TB register must be ≥ 15.
10. RB register must be ≥ 15.
2.19 AIC Responses to Improper Conditions
The AIC has provisions for responding to improper conditions. These improper conditions and the response
of the AIC to these conditions are presented in Table 2– 4.
2–11