TLC32040C, TLC32040I, TLC32041C, TLC32041I

ANALOG INTERFACE CIRCUITS

SLAS014E – SEPTEMBER 1987 – REVISED MAY 1995

22

POST OFFICE BOX 655303

delay distortion, SCF clock frequency = 288 kHz

±2%, input (IN+ – IN–) is ±3-V sinewave

Refer to filter response graphs for delay distortion specifications.

TLC32040 and TLC32041 bandpass filter transfer function (see curves),

SCF clock frequency = 288 kHz,

PARAMETER

TEST CONDITIONS

FREQUENCY

RANGE

MIN

MAX

UNIT

f = 100 Hz

–42

f = 170 Hz

–25

Filter gain, (see Note 10)

Input signal reference is 0 dB

300 Hz

≤ f ≤ 3.4 kHz

– 0.5

0.5

dB

f = 4 kHz

–16

f

≥ 4.6 kHz

–58

low-pass filter transfer function, SCF clock frequency = 288 kHz

±2% (see Note 9)

PARAMETER

TEST CONDITIONS

FREQUENCY

RANGE

MIN

MAX

UNIT

f

≤ 3.4 kHz

– 0.5

0.5

Filter gain (see Note 10)

Output signal reference is 0 dB

f = 3.6 kHz

–4

dB

Filter gain, (see Note 10)

Output signal reference is 0 dB

f = 4 kHz

–30

dB

f

≥ 4.4 kHz

–58

serial port

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VOH

High-level output voltage

IOH = – 300 µA

2.4

V

VOL

Low-level output voltage

IOL = 2 mA

0.4

V

II

Input current

±10

µA

Ci

Input capacitance

15

pF

Co

Output capacitance

15

pF

noise (measurement includes low-pass and bandpass switched-capacitor filters)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

Single ended

DX i

t

00 00 00 00 00 00 00

200

µV rms

Transmit noise

Differential

DX input = 00 00 00 00 00 00 00,

constant input code

300

500

µV rms

Differential

constant in ut code

20

dBrncO

Receive noise (see Note 11)

Inputs grounded

gain = 1

300

475

µV rms

Receive noise (see Note 11)

Inputs grounded,

gain = 1

20

dBrncO

† All typical values are at TA = 25°C.

NOTES:

9. The above filter specifications are for a switched-capacitor filter clock range of 288 kHz

±2%. For switched-capacitor filter clocks

at frequencies other than 288 kHz

±2%, the filter response is shifted by the ratio of switched-capacitor filter clock frequency to

288 kHz.

10. The filter gain outside of the passband is measured with respect to the gain at 1 kHz. The filter gain within the passband is measured

with respect to the average gain within the passband. The passbands are 300 to 3400 Hz and 0 to 3400 Hz for the bandpass and

low-pass filters respectively.

11. The noise is reffered to the input with a buffer gain of one. If the buffer gain is two or four, the noise figure is correspondingly reduced.

The noise is computed by statistically evaluating the digital output of the A/D converter.