TLV5580

8BIT, 80 MSPS LOW POWER A/D CONVERTER

SLAS205B − DECEMBER 1998 − REVISED OCTOBER 2003

www.ti.com

9

MSPS AND USE OF EXTERNAL VOLTAGE REFERENCES (unless otherwise noted) (continued)

TIMING REQUIREMENTS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fclk

Maximum conversion rate

80

MHz

fclk

Minimum conversion rate

10

kHz

td(o)

Output delay time (see Figure 1)

CL = 10 pF,

See Notes 5 and 6

4.5

9

ns

th(o)

Output hold time

CL = 2 pF,

See Note 5

2

ns

td(pipe)

Pipeline delay (latency)

See Note 6

4.5

4.5

4.5

CLK

cycles

td(a)

Aperture delay time

3

ns

tj(a)

Aperture jitter

See Note 5

1.5

ps, rms

tdis

Disable time, OE rising to Hi-Z

See Note 5

5

8

ns

ten

Enable, OE falling to valid data

5

8

ns

5. Output timing td(o) is measured from the 1.5 V level of the CLK input falling edge to the 10%/90% level of the digital output. The digital output load

is not higher than 10 pF.

Output hold time th(o) is measured from the 1.5 V level of the CLK input falling edge to the 10%/90% level of the digital output. The digital output

is load is not less than 2 pF.

Aperture delay td(A) is measured from the 1.5 V level of the CLK input to the actual sampling instant.

The OE signal is asynchronous.

OE timing tdis is measured from the VIH(MIN) level of OE to the high-impedance state of the output data. The digital output load is not higher than

10 pF.

OE timing ten is measured from the VIL(MAX) level of OE to the instant when the output data reaches VOH(min) or VOL(max) output levels. The digital

output load is not higher than 10 pF.

6. The number of clock cycles between conversion initiation on an input sample and the corresponding output data being made available from the

ADC pipeline. Once the data pipeline is full, new valid output data is provided on every clock cycle. In order to know when data is stable on the

output pins, the output delay time td(o) (i.e., the delay time through the digital output buffers) needs to be added to the pipeline latency. Note that

since the max. td(o) is more than 1/2 clock period at 80 MHz; data cannot be reliably clocked in on a rising edge of CLK at this speed. The falling

edge should be used.

D0−D7

N−4

N−3

N−2

N−1

N

N+1

N

N+1

N+2

N+3

N+4

N+5

tj(A)

td(A)

VIL

(max)

1.5 V

tw(CLKH)

tw(CLKL)

1/fCLK

th(o)

1.5 V

td(o)

tdis

ten

CLK

OE

90%

10%

VIH(min)

td(pipe)

VOH(min)

VOL(max)

VIL(max)

VIH

(min)

Figure 1. Timing Diagram