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TLV5580
8BIT, 80 MSPS LOW POWER A/D CONVERTER
SLAS205B DECEMBER 1998 REVISED OCTOBER 2003
www.ti.com
9
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING CONDITIONS WITH FCLK = 80
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
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.
D0D7
N4
N3
N2
N1
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