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General Description
The MAX1197 is a 3V, dual, 8-bit analog-to-digital con-
verter (ADC) featuring fully differential wideband track-
and-hold (T/H) inputs, driving two ADCs. The MAX1197
is optimized for low-power, small size, and high-dynam-
ic performance for applications in imaging, instrumenta-
tion and digital communications. This ADC operates
from a single 2.7V to 3.6V supply, consuming only
120mW while delivering a typical signal-to-noise and
distortion (SINAD) of 48.5dB at an input frequency of
30MHz and a sampling rate of 60Msps. The T/H-driven
input stages incorporate 400MHz (-3dB) input ampli-
fiers. The converters may also be operated with single-
ended inputs. In addition to low operating power, the
MAX1197 features a 3mA sleep mode as well as a
0.1µA power-down mode to conserve power during idle
periods.
An internal 2.048V precision bandgap reference sets
the full-scale range of the ADC. A flexible reference
structure allows the use of this internal or an externally
applied reference, if desired, for applications requiring
increased accuracy or a different input voltage range.
The MAX1197 features parallel, CMOS-compatible three-
state outputs. The digital output format can be set to two’s
complement or straight offset binary through a single con-
trol pin. The device provides for a separate output power
supply of 1.7V to 3.6V for flexible interfacing with various
logic families. The MAX1197 is available in a 7mm x 7mm,
48-pin TQFP package, and is specified for the extended
industrial (-40°C to +85°C) temperature range.
Pin-compatible lower and higher speed versions of the
MAX1197 are also available. Refer to the MAX1195 data
sheet for 40Msps and the MAX1198 data sheet for
100Msps. In addition to these speed grades, this family
will include a multiplexed output version (MAX1196,
40Msps), for which digital data is presented time inter-
leaved and on a single, parallel 8-bit output port.
For a 10-bit, pin-compatible upgrade, refer to the
MAX1182 data sheet. With the N.C. pins of the
MAX1197 internally pulled down to ground, this ADC
becomes a drop-in replacement for the MAX1182.
Applications
Features
Single 2.7V to 3.6V Operation
Excellent Dynamic Performance
48.5dB/45.3dB SINAD at f
IN
= 30MHz/200MHz
69dBc/53.5dBc SFDR at f
IN
= 30MHz/200MHz
-72dB Interchannel Crosstalk at f
IN
= 20MHz
Low Power
120mW (Normal Operation)
9mW (Sleep Mode)
0.3µW (Shutdown Mode)
0.05dB Gain and ±0.05° Phase Matching
Wide ±1V
P-P
Differential Analog Input Voltage
Range
400MHz -3dB Input Bandwidth
On-Chip 2.048V Precision Bandgap Reference
User-Selectable Output Format—Two’s
Complement or Offset Binary
Pin-Compatible 8-Bit and 10-Bit Upgrades
Available
MAX1197
Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with
Internal Reference and Parallel Outputs
________________________________________________________________ Maxim Integrated Products 1
N.C.
N.C.
OGND
OV
DD
OV
DD
OGND
N.C.
N.C.
D0B
D1B
D2B
D3B
COM
V
DD
GND
INA+
INA-
V
DD
GND
INB-
INB+
GND
V
DD
CLK
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
TQFP-EP
GND
V
DD
GND
V
DD
T/B
SLEEP
PD
OE
D7B
D6B
D5B
D4B
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
REFN
REFP
REFIN
REFOUT
D7A
D6A
D5A
D4A
D3A
D2A
D1A
D0A
MAX1197
Pin Configuration
Ordering Information
19-2411; Rev 0; 4/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Functional Diagram and Pin Compatible Upgrades table
appear at end of data sheet.
*EP = Exposed paddle
Baseband I/Q Sampling
Multichannel IF Sampling
Ultrasound and Medical
Imaging
Battery-Powered
Instrumentation
WLAN, WWAN, WLL,
MMDS Modems
Set-Top Boxes
VSAT Terminals
PART TEMP RANGE PIN-PACKAGE
MAX1197ECM -40°C to +85°C 48 TQFP-EP*
Zobrazit stránku 0
1 2 3 4 5 6 ... 21 22

Shrnutí obsahu

Strany 1 - Ordering Information

General DescriptionThe MAX1197 is a 3V, dual, 8-bit analog-to-digital con-verter (ADC) featuring fully differential wideband track-and-hold (T/H) inpu

Strany 2 - ELECTRICAL CHARACTERISTICS

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs10 __________________________________________________________

Strany 3

Detailed DescriptionThe MAX1197 uses a seven-stage, fully differential,pipelined architecture (Figure 1) that allows for high-speed conversion while m

Strany 4

MAX1197are closed. The fully differential circuits sample theinput signals onto the two capacitors (C2a and C2b)through switches S4a and S4b. S2a and

Strany 5

Match the impedance of INA+ and INA-, as well asINB+ and INB-, and set the common-mode voltage tomid-supply (VDD/2) for optimum performance.Analog Inp

Strany 6

MAX1197where fINrepresents the analog input frequency andtAJis the time of the aperture jitter.Clock jitter is especially critical for undersamplingap

Strany 7

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Strany 8

MAX1197lation. The 22pF CINcapacitor acts as a small filtercapacitor.Using Transformer CouplingAn RF transformer (Figure 6) provides an excellentsolut

Strany 9

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Strany 10 - Pin Description

MAX1197modulation (QAM). Typically found in spread-spectrum-based systems, a QAM signal represents a carrier fre-quency modulated in both amplitude an

Strany 11 - Pin Description (continued)

inductance. Bypass VDD, REFP, REFN, and COM withtwo parallel 0.1µF ceramic capacitors and a 2.2µFbipolar capacitor to GND. Follow the same rules tobyp

Strany 12

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs2 ___________________________________________________________

Strany 13 - Analog Inputs and Reference

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs20 __________________________________________________________

Strany 14 - Applications Information

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Strany 15

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel OutputsMaxim cannot assume responsibility for use of any circuitry o

Strany 16 - Multiple ADCs

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Strany 17

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs4 ___________________________________________________________

Strany 18 - Grounding, Bypassing

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Strany 19 - Dynamic Parameter Definitions

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs6 ___________________________________________________________

Strany 20 - Chip Information

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Strany 21 - Functional Diagram

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs8 ___________________________________________________________

Strany 22 - Package Information

MAX1197Dual, 8-Bit, 60Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

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