Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External , Internal TQFP 48 EP

General Description

The MAX1184 is a 3V, dual 10-bit analog-to-digital con-

verter (ADC) featuring fully-differential wideband track-

and-hold (T/H) inputs, driving two pipelined, 9-stage

ADCs. The MAX1184 is optimized for low-power, high-

dynamic performance applications in imaging, instru-

mentation, and digital communication applications. This

ADC operates from a single 2.7V to 3.6V supply, con-

suming only 105mW while delivering a typical signal-to-

noise ratio (SNR) of 59.5dB at an input frequency of

7.5MHz and a sampling rate of 20Msps. The T/H driven

input stages incorporate 400MHz (-3dB) input amplifiers.

The converters may also be operated with single-ended

inputs. In addition to low operating power, the MAX1184

features a 2.8mA sleep mode as well as a 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 the internal or an externally

derived reference, if desired for applications requiring

increased accuracy or a different input voltage range.

The MAX1184 features parallel, CMOS-compatible

three-state outputs. The digital output format is set to

two’s complement or straight offset binary through a sin-

gle control pin. The device provides for a separate out-

put power supply of 1.7V to 3.6V for flexible interfacing.

The MAX1184 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 MAX1184

are also available. See Table 2 at end of data sheet for a

list of pin-compatible versions. Refer to the MAX1180

data sheet for 105Msps, the MAX1181 data sheet for

80Msps, the MAX1182 data sheet for 65Msps, and the

MAX1183 data sheet for 40Msps. In addition to these

speed grades, this family includes a 20Msps multi-

plexed output version (MAX1185), for which digital data

is presented time-interleaved on a single, parallel 10-bit

output port.

Applications

High-Resolution Imaging

I/Q Channel Digitization

Multchannel IF Undersampling

Instrumentation

Video Application

Features

♦ Single 3V Operation

♦ Excellent Dynamic Performance:

59.5dB SNR at f

= 7.5MHz

74dB SFDR at f

= 7.5MHz

♦ Low Power:

35mA (Normal Operation)

2.8mA (Sleep Mode)

1µA (Shutdown Mode)

♦ 0.02dB Gain and 0.25° Phase Matching (typ)

♦ 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

♦ 48-Pin TQFP Package with Exposed Paddle for

Improved Thermal Dissipation

♦ Evaluation Kit Available

MAX1184

Dual 10-Bit, 20Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

________________________________________________________________ Maxim Integrated Products 1

D1A

D0A

OGND

D0B

D1B

D2B

D3B

D4B

D5B

COM

GND

INA+

INA-

GND

INB-

INB+

GND

CLK

48 TQFP-EP

MAX1184

GND

T/B

SLEEP

D9B

D8B

D7B

D6B

REFN

REFP

REFIN

REFOUT

D9A

D8A

D7A

D6A

D5A

D4A

D3A

D2A

Pin Configuration

19-2174; Rev 1; 7/06

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX1184ECM -40°C to +85°C 48 TQFP-EP*

MAX1184ECM+ -40°C to +85°C 48 TQFP-EP*

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.

*EP = Exposed paddle.

+Denotes lead-free package.

NOTE: THE PIN 1 INDICATOR FOR LEAD-FREE PACKAGE IS REPLACED BY A “+” SIGN.

Summary of content (21 pages)

PAGE 1
9-2174; Rev 1; 7/06 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs Applications High-Resolution Imaging I/Q Channel Digitization Multchannel IF Undersampling PART TEMP RANGE MAX1184ECM PIN-PACKAGE -40°C to +85°C 48 TQFP-EP* MAX1184ECM+ -40°C to +85°C *EP = Exposed paddle. 48 TQFP-EP* +Denotes lead-free package.
PAGE 2
MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs ABSOLUTE MAXIMUM RATINGS VDD, OVDD to GND...............................................-0.3V to +3.6V OGND to GND.......................................................-0.3V to +0.3V INA+, INA-, INB+, INB- to GND ...............................-0.3V to VDD REFIN, REFOUT, REFP, REFN, CLK, COM to GND ..........................................-0.3V to (VDD + 0.3V) OE, PD, SLEEP, T/B, D9A–D0A, D9B–D0B to OGND .........
PAGE 3
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs (VDD = 3V, OVDD = 2.5V, 0.1µF and 1.0µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to COM), CL = 10pF at digital outputs (Note 1), fCLK = 20MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs ELECTRICAL CHARACTERISTICS (continued) (VDD = 3V, OVDD = 2.5V, 0.1µF and 1.0µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to. COM), CL = 10pF at digital outputs (Note 1), fCLK = 20MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs (VDD = 3V, OVDD = 2.5V, 0.1µF and 1.0µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to. COM), CL = 10pF at digital outputs (Note 1), fCLK = 20MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2.7 3.0 3.6 V 1.
PAGE 6
Typical Operating Characteristics (VDD = 3V, OVDD = 2.5V, VREFIN = 2.048V, differential input at -0.5dBFS, fCLK = 20MHz, CL ≈ 10pF, TA = +25°C, unless otherwise noted.) -40 -50 HD3 -70 -40 -50 -60 HD3 -70 HD2 -80 -20 -30 -50 -60 -90 -90 -90 -100 -100 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 0 10 2 3 4 5 6 7 8 FFT PLOT CHB (DIFFERENTIAL INPUT, 8192-POINT DATA RECORD) TWO-TONE IMD PLOT DIFFERENTIAL INPUT, 8192-POINT DATA RECORD SIGNAL-TO-NOISE RATIO vs.
PAGE 7
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs 6 4 VIN = 100mVP-P 4 60 2 0 -2 0 -2 -4 -4 -6 -6 -8 55 SNR (dB) GAIN (dB) 40 -8 1 10 100 1000 35 1 10 100 1000 -20 -12 -8 -4 0 ANALOG INPUT FREQUENCY (MHz) ANALOG INPUT POWER (dBFS) SIGNAL-TO-NOISE PLUS DISTORTION vs. ANALOG INPUT POWER (fIN = 7.5344MHz) TOTAL HARMONIC DISTORTION vs. ANALOG INPUT POWER (fIN = 7.5344MHz) SPURIOUS-FREE DYNAMIC RANGE vs. ANALOG INPUT POWER (fIN = 7.
PAGE 8
Typical Operating Characteristics (continued) (VDD = 3V, OVDD = 2.5V, VREFIN = 2.048V, differential input at -0.5dBFS, fCLK = 20MHz, CL ≈ 10pF, TA = +25°C, unless otherwise noted.) ANALOG SUPPLY CURRENT vs. ANALOG SUPPLY VOLTAGE OFFSET ERROR vs. TEMPERATURE MAX1184 toc20 35 IVDD (mA) 0 OFFSET ERROR (%FS) 36 MAX1184 toc19 0.1 -0.1 CHB -0.2 34 33 32 -0.3 CHA 31 -0.4 -15 10 35 60 3.00 3.15 3.30 3.45 VDD (V) ANALOG SUPPLY CURRENT vs. TEMPERATURE ANALOG POWER-DOWN CURRENT vs.
PAGE 9
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs INTERNAL REFERENCE VOLTAGE vs. TEMPERATURE MAX1184 toc25 70,000 2.010 MAX1184 toc26 OUTPUT NOISE HISTOGRAM (DC INPUT) 2.015 64,515 63,000 56,000 COUNTS VREOUT (V) 49,000 2.005 42,000 35,000 28,000 2.000 21,000 1.995 14,000 7,000 1.990 0 -40 -15 10 35 60 85 TEMPERATURE (°C) 0 869 N-2 N-1 N 152 0 N+1 N+2 DIGITAL OUTPUT CODE Pin Description PIN NAME 1 COM Common-Mode Voltage Input/Output.
PAGE 10
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs MAX1184 Pin Description (continued) 10 PIN NAME 21 D9B Three-State Digital Output, Bit 9 (MSB), Channel B FUNCTION 22 D8B Three-State Digital Output, Bit 8, Channel B 23 D7B Three-State Digital Output, Bit 7, Channel B 24 D6B Three-State Digital Output, Bit 6, Channel B 25 D5B Three-State Digital Output, Bit 5, Channel B 26 D4B Three-State Digital Output, Bit 4, Channel B 27 D3B Three-State Digital
PAGE 11
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs converters (DACs) convert the digitized results back into analog voltages, which are then subtracted from the original held input signals. The resulting error signals are then multiplied by two and the residues are passed along to the next pipeline stages, where the process is repeated until the signals have been processed by all nine stages.
PAGE 12
MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs INTERNAL BIAS S2b set the common mode for the amplifier input, and open simultaneously with S1, sampling the input waveform. Switches S4a and S4b are then opened before switches S3a and S3b, connect capacitors C1a and C1b to the output of the amplifier, and switch S4c is closed. The resulting differential voltages are held on capacitors C2a and C2b.
PAGE 13
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs ⎛ ⎞ 1 SNR = 20 × log ⎜ ⎟ ⎝ 2 × π × f IN × t AJ ) ⎠ where fIN represents the analog input frequency and tAJ is the time of the aperture jitter. Clock jitter is especially critical for undersampling applications. The clock input should always be considered as an analog input and routed away from any analog input or other digital signal lines. The MAX1184 clock input operates with a voltage threshold set to VDD/2.
PAGE 14
MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs Table 1.
PAGE 15
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs MAX1184 +5V 0.1µF LOWPASS FILTER INA+ MAX4108 RIS0 50Ω 0.1µF 300Ω CIN 22pF 0.1µF -5V 600Ω 600Ω 300Ω COM +5V 0.1µF +5V 0.1µF 600Ω INPUT 0.1µF LOWPASS FILTER MAX4108 300Ω -5V 0.1µF INA- MAX4108 RIS0 50Ω 300Ω CIN 22pF 0.1µF -5V 300Ω 300Ω +5V 600Ω MAX1184 0.1µF LOWPASS FILTER INB+ MAX4108 RIS0 50Ω 0.1µF 300Ω CIN 22pF 0.1µF -5V 600Ω 600Ω 300Ω +5V 0.1µF +5V 0.1µF 600Ω INPUT 0.
PAGE 16
MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs 25Ω REFP INA+ 22pF VIN 0.1µF 1 VIN T1 0.1µF 6 1kΩ RISO 50Ω INA+ MAX4108 N.C. 2 5 3 4 100Ω COM 2.2µF 1kΩ CIN 22pF 0.1µF REFN MINICIRCUITS TT1–6 COM 0.1µF 25Ω INA- INA- 100Ω 22pF RISO 50Ω CIN 22pF REFP MAX1184 MAX1184 25Ω INB+ VIN 0.1µF 22pF 1 N.C. INB+ MAX4108 0.1µF VIN 1kΩ RISO 50Ω 2 3 T1 100Ω 6 5 4 1kΩ REFN 2.2µF 0.1µF MINICIRCUITS TT1–6 100Ω 25Ω INB- 0.
PAGE 17
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs MAX1184 MAX2451 INA+ INA0° 90° MAX1184 DSP POST PROCESSING INB+ INBDOWNCONVERTER ÷8 Figure 8. Typical QAM Application, Using the MAX1184 Typical QAM Demodulation Application The most frequently used modulation technique for digital communications applications is probably the quadrature amplitude modulation (QAM).
PAGE 18
MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs Differential Nonlinearity (DNL) Signal-to-Noise Plus Distortion (SINAD) Differential nonlinearity is the difference between an actual step width and the ideal value of 1LSB. A DNL error specification of less than 1LSB guarantees no missing codes and a monotonic transfer function. SINAD is computed by taking the ratio of the RMS signal to all spectral components minus the fundamental and the DC offset.
PAGE 19
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs VDD OGND OVDD GND INA+ PIPELINE ADC T/H 10 DEC OUTPUT DRIVERS 10 D9A–D0A INA- CONTROL CLK OE INB+ T/H PIPELINE ADC 10 DEC OUTPUT DRIVERS 10 D9B–D0B INB- REFERENCE MAX1184 REFOUT REFN COM REFP 19 REFIN ______________________________________________________________________________________ T/B PD SLEEP MAX1184 Functional Diagram
PAGE 20
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 48L,TQFP.EPS MAX1184 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs PACKAGE OUTLINE, 48L TQFP, 7x7x1.
PAGE 21
Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs PACKAGE OUTLINE, 48L TQFP, 7x7x1.0mm EP OPTION 21-0065 G 2 2 Revision History Pages changed at Rev 1: Title change—all pages, 1–21 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.