MAX101A Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 500Msps, 8-Bit ADC with Track/Hold

19-1109; Rev 0; 7/96
EVALUAATVIOANILKAIBTLMEANUAL
500Msps, 8-Bit ADC with Track/Hold
_______________General Description
The MAX101A ECL-compatible, 500Msps, 8-bit analog-
to-digital converter (ADC) allows accurate digitizing of
analog signals from DC to 250MHz (Nyquist frequen-
cy). Dual monolithic converters, driven by the track/hold
(T/H), operate on opposite clock edges (time inter-
leaved). Designed with Maxim’s proprietary advanced
bipolar processes, the MAX101A contains a high-per-
formance T/H amplifier and two quantizers in an 84-pin
ceramic flat pack.
The innovative design of the internal T/H ensures an
exceptionally wide 1.2GHz input bandwidth and aper-
ture delay uncertainty of less than 2ps, resulting in a
high 7.0 effective bits at the Nyquist frequency. Special
comparator output design and decoding circuitry
reduce out-of-sequence code errors. The probability of
erroneous codes due to metastable states is reduced to
less than 1 error per 10¹⁵ clock cycles. And, unlike other
ADCs that can have errors resulting in false full-scale or
zero-scale outputs, the MAX101A keeps the error mag-
nitude to less than 1LSB.
The analog input is designed for either differential or
single-ended use with a ±250mV range. Sense pins for
the reference input allow full-scale calibration of the
input range or facilitate ratiometric use.
Phase adjustment is available to adjust the relative
sampling of the converter halves for optimizing convert-
er performance. Input clock phasing is also available
for interleaving several MAX101As for higher effective
sampling rates.
____________________________Features
o 500Msps Conversion Rate
o 7.0 Effective Bits Typical at 250MHz
o 1.2GHz Analog Input Bandwidth
o Less than ±1/2LSB INL
o 50Ω Differential or Single-Ended Inputs
o ±250mV Input Signal Range
o Ratiometric Reference Inputs
o Dual Latched Output Data Paths
o Low Error Rate, Less than 10^-15 Metastable States
o 84-Pin Ceramic Flat Pack
________________________Applications
High-Speed Digital Instrumentation
High-Speed Signal Processing
Medical Systems
Radar/Signal Processing
High-Energy Physics
Communications
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX101ACFR*
0°C to +70°C
84 Ceramic Flat Pack
(with heatsink)
*Contact factory for 84-pin ceramic flat pack without heatsink.
_________________________________________________________Functional Diagram
MAX101A
AIN+
AIN-
TRACK
AND
HOLD
CLK
CLK
VA_RT VA_RTS
STROBE
TRK1 _TRK1 PH_ADJ VB_RT VB_RTS
FLASH CONVERTER
(8 -BIT)
FLASH CONVERTER
(8 -BIT)
VARBS VA_RB
8
STROBE
8
VBRBS VBRB
L
A
T
C
H
E
S
8
ADATA
B
U
F
DCLK
F
E
DCLK
R
L
8
A
BDATA
T
C
H
E
S
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