_______________General Description
The MAX100 ECL-compatible, 250Msps, 8-bit analog-to-
digital converter (ADC) allows accurate digitizing of ana-
log signals from DC to 125MHz (Nyquist frequency).
Designed with Maxim’s proprietary advanced bipolar
processes, the MAX100 contains a high-performance
track/hold (T/H) amplifier and a quantizer in a single
ceramic strip-line package.
The innovative design of the internal T/H assures an
exceptionally wide input bandwidth of 1.2GHz and aper-
ture delay uncertainty of less than 2ps, resulting in a high
6.8 effective bits performance. Special comparator output
design and decoding circuitry reduce out-of-sequence
code errors. The probability of erroneous codes occurring
due to metastable states is reduced to less than 1 error
per 10
15
clock cycles. Unlike other ADCs, which can
have errors that result in false full-scale or zero-scale out-
puts, the MAX100 keeps the magnitude to less than 1LSB.
The analog input is designed for either differential or single-
ended use with a ±270mV range. Sense pins for the refer-
ence input allow full-scale calibration of the input range or
facilitate ratiometric use. Midpoint tap for the reference
string is available for applications that need to modify the
output coding for a user-defined bilinear response. Use of
separate high-current and low-current ground pins pro-
vides better noise immunity and highest device accuracy.
Dual output data paths provide several data output modes
for easy interfacing. These modes can be configured as
either one or two identical latched ECL outputs. An 8:16
demultiplexer mode that reduces the output data rates to
one-half the clock rate is also available.
For applications that require faster data rates, refer to
Maxim’s MAX101, which allows conversion rates up to
500Msps.
____________________________Features
♦ 250Msps Conversion Rate
♦ 6.8 Effective Bits at 125MHz
♦ Less than ±1/2LSB INL
♦ 50Ω Differential or Single-Ended Inputs
♦ ±270mV Input Signal Range
♦ Reference Sense Inputs
♦ Ratiometric Reference Inputs
♦ Configurable Dual-Output Data Paths
♦ Latched, ECL-Compatible Outputs
♦ Low Error Rate, Less than 10
-15
Metastable States
♦ Selectable On-Chip 8:16 Demultiplexer
♦ 84-Pin Ceramic Flat Pack
________________________Applications
High-Speed Digital Instrumentation
High-Speed Signal Processing
Medical Systems
Radar/Sonar
High-Energy Physics
Communications
______________Ordering Information
MAX100
________________________________________________________________
Maxim Integrated Products
1
DCLK
DCLK
A=B
DIVMOD
BData
(B0–B7)
AData
(A0–A7)
AIN+
AIN-
CLK
CLK
VA
RT
VA
RTS
VA
RB
VA
RBS
VA
CT
VA
CTS
L
A
T
C
H
E
S
B
U
F
F
E
R
L
A
T
C
H
E
S
MODE
CONTROL
TRACK/
HOLD
FLASH CONVERTER
8 8
8
_________________________________________________________Functional Diagram
Call toll free 1-800-998-8800 for free literature.
PART
MAX100CFR* 0°C to +70°C
TEMP. RANGE PIN-PACKAGE
84 Ceramic Flat Pack (with heatsink)
19-0282; Rev 0; 7/94
EVALUATION KIT
AVAILABLE
*Contact factory for 84-Pin Ceramic Flat Pack without heatsink.
250Msps, 8-Bit ADC with Track/Hold
MAX100
250Msps, 8-Bit ADC with Track/Hold
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS (Note 1)
ELECTRICAL CHARACTERISTICS
(V
EE
= -5.2V, V
CC
= +5V, R
L
= 50Ω to -2V, VA
RT
= 1.02V, VA
RB
= -1.02V, T
MIN
to T
MAX
= 0°C to +70°C, T
A
= +25°C, unless
otherwise noted.) (Note 3)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: The digital control inputs are diode protected; however, permanent damage may occur on unconnected units under high-
energy electrostatic fields. Keep unused units in conductive foam or shunt the terminals together. Discharge the conduc-
tive foam to the destination socket before insertion.
Note 2: Typical thermal resistance, junction-to-case R
θJC
= 5°C/W and thermal resistance, junction to ambient (MAX100CA) R
θJA
=
12°C/W, providing 200 lineal ft/min airflow with heatsink. See
Package Information.
Supply Voltages
V
CC
.............................................................................0V to +7V
V
EE
...............................................................................-7V to 0V
V
CC -
V
EE
............................................................................+12V
Analog Input Voltage.............................................................±2V
Digital Input Voltage.................................................-2.3V to +0V
Reference Voltage (VA
RT
).....................................-0.3V to +1.5V
Reference Voltage (VA
RB
).....................................-1.5V to +0.3V
Data Output Current ..........................................................-33mA
DCLK Output Current ........................................................-43mA
Operating Temperature Range...............................0°C to +70°C
Operating Junction Temperature (Note 2)............0°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+250°C
AData, BData
CONDITIONS
±0.5
Bits8Resolution
LSB
±0.6
INLIntegral Nonlinearity (Note 4)
UNITSMIN TYP MAXSYMBOLPARAMETER
f
CLK
= 250MHz,
V
IN
= 95% full scale
(Note 5)
Bits7.1
7.4
6.8
ENOBEffective Bits
Figure 5
Figure 5
(Note 7)
f
AIN
= 50MHz, f
CLK
= 250MHz, V
IN
= 95%
full scale (Note 6)
ps2t
AJ
ps270t
AW
Aperture Width
Aperture Jitter
230 315
Msps250f
CLK
Maximum Conversion Rate
dB44.5SNRSignal-to-Noise Ratio
GHz1.2BW
3dB
Analog Input Bandwidth
AIN+ to AIN-, Table 2,
T
A
= T
MIN
to T
MAX
mV
-305 -215
V
IN
Input Voltage Range
AIN+ and AIN- with respect to GND
T
A
= T
MIN
to T
MAX
AIN+, AIN-, T
A
= T
MIN
to T
MAX
Ω/°C0.008
Input Resistance
Temperature Coefficient
Ω49 51R
I
Input Resistance
mV1.8 2.5LSB
mV-17 +32V
IO
Input Offset Voltage
Least-Significant-Bit Size
T
A
= +25°C
T
A
= T
MIN
to T
MAX
AData, BData,
no missing codes
±0.75T
A
= +25°C
T
A
= T
MIN
to T
MAX
LSB
±0.85
DNLDifferential Nonlinearity
f
AIN
= 10MHz
f
AIN
= 50MHz
f
AIN
= 125MHz
Full scale
Zero scale
ACCURACY
DYNAMIC SPECIFICATIONS
ANALOG INPUT