TLV1549C, TLV1549I, TLV1549M

10-BIT ANALOG-TO-DIGITAL CONVERTERS

WITH SERIAL CONTROL

SLAS071C – JANUARY 1993 – REVISED MARCH 1995

7

POST OFFICE BOX 655303

recommended operating conditions

MIN

NOM

MAX

UNIT

Supply voltage, VCC

3

3.3

3.6

V

Positive reference voltage, Vref + (see Note 2)

VCC

V

Negative reference voltage, Vref – (see Note 2)

0

V

Differential reference voltage, Vref + – Vref – (see Note 2)

2.5

VCC

VCC + 0.2

V

Analog input voltage (see Note 2)

0

VCC

V

High-level control input voltage, VIH

VCC = 3 V to 3.6 V

2

V

Low-level control input voltage, VIL

VCC = 3 V to 3.6 V

0.6

V

Clock frequency at I/O CLOCK (see Note 3)

0

2.1

MHz

Setup time, CS low before first I/O CLOCK

↑, tsu(CS) (see Note 4)

1.425

µs

Hold time, CS low after last I/O CLOCK

↓, th(CS)

0

ns

Pulse duration, I/O CLOCK high, twH(I/O)

190

ns

Pulse duration, I/O CLOCK low, twL(I/O)

190

ns

Transition time, I/O CLOCK, tt(I/O) (see Note 5 and Figure 5)

1

µs

Transition time, CS, tt(CS)

10

µs

TLV1549C

0

70

°C

Operating free-air temperature, TA

TLV1549I

–40

85

°C

TLV1549M

–55

125

°C

NOTES:

2. Analog input voltages greater than that applied to REF + convert as all ones (1111111111), while input voltages less than that applied

to REF – convert as all zeros (0000000000). The TLV1549 is functional with reference voltages down to 1 V (Vref + – Vref –); however,

the electrical specifications are no longer applicable.

3. For 11- to 16-bit transfers, after the tenth I/O CLOCK falling edge (

≤ 2 V), at least one I/O CLOCK rising edge (≥ 2 V) must occur

within 9.5

µs.

4. To minimize errors caused by noise at CS, the internal circuitry waits for a setup time plus two falling edges of the internal system

clock after CS

↓ before responding to the I/O CLOCK. Therefore, no attempt should be made to clock out the data until the minimum

CS setup time has elapsed.

5. This is the time required for the clock input signal to fall from VIHmin to VILmax or to rise from VILmax to VIHmin. In the vicinity of

normal room temperature, the device functions with input clock transition time as slow as 1

µs for remote data-acquisition

applications where the sensor and the A / D converter are placed several feet away from the controlling microprocessor.