Rainbow-electronics MAX1195 Bedienungsanleitung

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General Description
The MAX1195 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 MAX1195
is optimized for low-power, small size, and high-dynamic
performance for applications in imaging, instrumentation
and digital communications. This ADC operates from a
single 2.7V to 3.6V supply, consuming only 87mW while
delivering a typical signal-to-noise and distortion (SINAD)
of 48.5dB at an input frequency of 20MHz and a sam-
pling rate of 40Msps. The T/H-driven input stages incor-
porate 400MHz (-3dB) input amplifiers. The converters
may also be operated with single-ended inputs. In addi-
tion to low operating power, the MAX1195 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 MAX1195 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 MAX1195 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 higher speed versions of the MAX1195
are also available. Refer to the MAX1197 data sheet for
60Msps 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 interleaved and on
a single, parallel 8-bit output port.
For a 10-bit, pin-compatible upgrade, refer to the
MAX1183 data sheet. With the N.C. pins of the MAX1195
internally pulled down to ground, this ADC becomes a
drop-in replacement for the MAX1183.
Applications
Features
Single 2.7V to 3.6V Operation
Excellent Dynamic Performance
48.5dB/46.7dB SINAD at f
IN
= 20MHz/200MHz
68.7dBc/55.7dBc SFDR at f
IN
= 20MHz/200MHz
-72dB Interchannel Crosstalk at f
IN
= 20MHz
Low Power
87mW (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
MAX1195
Dual, 8-Bit, 40Msps, 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
MAX1195
Pin Configuration
Ordering Information
19-2410; 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
MAX1195ECM -40°C to +85°C 48 TQFP-EP*
Seitenansicht 0
1 2 3 4 5 6 ... 21 22

Inhaltsverzeichnis

Seite 1 - Ordering Information

General DescriptionThe MAX1195 is a 3V, dual, 8-bit analog-to-digital con-verter (ADC) featuring fully differential wideband track-and-hold (T/H) inpu

Seite 2 - ELECTRICAL CHARACTERISTICS

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs10 __________________________________________________________

Seite 3

Detailed DescriptionThe MAX1195 uses a seven-stage, fully differential,pipelined architecture (Figure 1) that allows for high-speed conversion while m

Seite 4

MAX1195taneously with S1 sampling the input waveform.Switches S4a, S4b, S5a, and S5b are then openedbefore switches S3a and S3b connects capacitors C1

Seite 5

Analog Inputs and ReferenceConfigurationsThe full-scale range of the MAX1195 is determined bythe internally generated voltage difference betweenREFP (

Seite 6

MAX1195where fINrepresents the analog input frequency andtAJis the time of the aperture jitter.Clock jitter is especially critical for undersamplingap

Seite 7

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Seite 8

MAX1195Using Transformer CouplingAn RF transformer (Figure 6) provides an excellentsolution to convert a single-ended source signal to afully differen

Seite 9

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Seite 10 - Pin Description

MAX1195quadrature outputs, a local oscillator followed by sub-sequent upconversion can generate the QAM signal.The result is an in-phase (I) and a qua

Seite 11 - Pin Description (continued)

Grounding, Bypassing, and Board LayoutThe MAX1195 requires high-speed board layout designtechniques. Locate all bypass capacitors as close tothe devic

Seite 12

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs2 ___________________________________________________________

Seite 13 - Analog Inputs and Reference

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs20 __________________________________________________________

Seite 14 - Applications Information

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Seite 15

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel OutputsMaxim cannot assume responsibility for use of any circuitry o

Seite 16 - Multiple ADCs

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Seite 17

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs4 ___________________________________________________________

Seite 18

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Seite 19 - Static Parameter Definitions

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs6 ___________________________________________________________

Seite 20 - Chip Information

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

Seite 21 - Functional Diagram

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs8 ___________________________________________________________

Seite 22 - Package Information

MAX1195Dual, 8-Bit, 40Msps, 3V, Low-Power ADC withInternal Reference and Parallel Outputs_____________________________________________________________

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