_______________General Description
The MAX1002 is a dual, 6-bit analog-to-digital converter
(ADC) that combines high-speed, low-power operation
with a user-selectable input range, an internal refer-
ence, and a clock oscillator. The dual, parallel ADCs
are designed to convert in-phase (I) and quadrature
(Q) analog signals into two 6-bit offset-binary-coded
digital outputs at sampling rates up to 60Msps while
achieving typical integral nonlinearity (INL) and differ-
ential nonlinearity (DNL) of ±1/4LSB. The ability to
interface directly with baseband I and Q signals makes
the MAX1002 ideal for use in direct-broadcast satellite,
VSAT, and QAM16 demodulation applications.
The MAX1002 input amplifiers feature true differential
inputs, a 55MHz -0.5dB analog bandwidth, and user-
programmable input full-scale ranges of 125mVp-p,
250mVp-p, or 500mVp-p. With an AC-coupled input
signal, matching performance between input channels
is typically 0.1dB gain, 1/4LSB offset, and 0.5° phase.
Dynamic performance is 5.85 effective number of bits
(ENOB) with a 20MHz analog input signal, or 5.78
ENOB with a 50MHz input signal.
The MAX1002 operates with a single +5V power supply
and provides TTL-compatible digital outputs. The device
is available in the commercial temperature range (0°C to
+70°C) and comes in a 36-pin SSOP package.
________________________Applications
Direct Broadcast Satellite (DBS) Receivers
VSAT Receivers
Wide Local Area Networks (WLAN)
Cable Television Set-Top Boxes
____________________________Features
♦ ±1/4LSB INL and DNL, Typical
♦ 1/4LSB (typ) Channel-to-Channel Offset Matching
♦ 0.1dB Gain and 0.5° Phase Matching, Typical
♦ Internal Bandgap Voltage Reference
♦ Two Matched 6-Bit, 60Msps ADCs
♦ Excellent Dynamic Performance:
5.85 ENOB with 20MHz Analog Input
5.7 ENOB with 50MHz Analog Input
♦ Internal Oscillator with Overdrive Capability
♦ 55MHz (-0.5dB) Bandwidth Input Amplifiers
with True Differential Inputs
♦ User-Selectable Input Full-Scale Range
(125mVp-p, 250mVp-p, or 500mVp-p)
♦ Single-Ended or Differential Input Drive
♦ +5V Single Supply
♦ TTL Outputs
♦ 90Msps Upgrade with +3.3V CMOS-Compatible
Output Available (MAX1003)
MAX1002
Low-Power, 60Msps, Dual, 6-Bit ADC
________________________________________________________________
Maxim Integrated Products
1
MAX1002
DATA
BUFFER
Q
CLOCK
DRIVER
D0I–D5I
DCLK
TNK+
TNK-
DQ0–DQ5
INPUT
AMP
I
IIN+
IIN-
GAIN
QIN+
QIN-
CLOCK
OUT
DATA
BUFFER
I
6
ADC
I
ADC
Q
VREF
VREF
BANDGAP
REFERENCE
OFFSET
CORREC-
TION Q
OFFSET
CORREC-
TION I
INPUT
AMP
Q
QOCC+ QOCC-
IOCC+ IOCC-
6
6
6
_________________________________________________________Functional Diagram
19-1270; Rev 0; 7/97
PART
MAX1002CAX 0°C to +70°C
TEMP. RANGE PIN-PACKAGE
36 SSOP
EVALUATION KIT
AVAILABLE
______________Ordering Information
Pin Configuration appears at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 408-737-7600 ext. 3468.
MAX1002
Low-Power, 60Msps, Dual, 6-Bit ADC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
, V
CCO
= +5V ±5%; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
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.
V
CC
to GND .........................................................-0.3V to +6.5V
V
CCO
to OGND.........................................................-0.3V, +6.5V
GND to OGND .........................................................-0.3V, +0.3V
Digital and Clock Output Pins to OGND ........-0.3V, V
CCO
(<10sec)
All Other Pins to GND..................................................-0.3V, V
CC
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 45mW/°C above +70°C) ......................941mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, <10sec)...........................+300°C
CONDITIONS
LSB-0.5 ±0.25 0.5INLIntegral Nonlinearity
Bits6RESResolution
UNITSMIN TYP MAXSYMBOLPARAMETER
GAIN = open (mid gain)
GAIN = V
CC
(high gain)
No missing codes over temperature
237.5 250 262.5V
FSM
118.75 125 131.25V
FSH
LSB-0.5 ±0.25 0.5DNLDifferential Nonlinearity
Other analog input driven with external source
(Note 2)
Guaranteed by design
V1.75 2.75V
CM
GAIN = GND (low gain)
Common-Mode Voltage Range
pF3 5C
IN
Input Capacitance
kΩ13 20 29R
IN
Input Resistance
V2.25 2.35 2.45V
AOC
Input Open-Circuit Voltage
mVp-p
475 500 525V
FSL
Full-Scale Input Range
Other oscillator input tied to V
CC
+ 0.3V
I
SOURCE
= 50µA V2.4V
OH
Digital Outputs Logic-High
Voltage
kΩ4.8 8 12.1R
OSC
Oscillator Input Resistance
I
SINK
= 400µA V0.5V
OL
Digital Outputs Logic-Low
Voltage
V
CC
= 4.75V to 5.25V (Note 3)
20MHz, FS I & Q analog inputs,
C
LOAD
= 15pF (Note 4)
mW380PDPower Dissipation
mA24I
CCO
Digital Outputs Supply Current
dB-75 -40PSRRPower-Supply Rejection Ratio
mA63 104I
CC
Supply Current
DC ACCURACY (Note 1)
INVERTING AND NONINVERTING ANALOG INPUTS
OSCILLATOR INPUTS
DIGITAL OUTPUTS (DI0–DI5, DQ0–DQ5)
POWER SUPPLY