MAXIM MAX1185 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs

19-2175; Rev 3; 5/11

Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs General Description Features

The MAX1185 is a 3V, dual 10-bit analog-to-digital con- Single 3V Operation verter (ADC) featuring fully-differential wideband track- Excellent Dynamic Performance:

and-hold (T/H) inputs, driving two pipelined, nine-stage 59.5d B SNR at f IN = 7.5MHz

ADCs. The MAX1185 is optimized for low-power, high 74d B SFDR at f IN = 7.5MHz dynamic performance applications in imaging, instru- Low Power: mentation, and digital communication applications. This 35m A (Normal Operation) ADC operates from a single 2.7V to 3.6V supply, con- 2.8m A (Sleep Mode) suming only 105m W while delivering a typical signal-to- 1µA (Shutdown Mode)

noise ratio (SNR) of 59.5d B at an input frequency of 0.02d B Gain and 0.25° Phase Matching 7.5MHz and a sampling rate of 20Msps. Digital outputs Wide ±1Vp-p Differential Analog Input Voltage A and B are updated alternating on the rising (CHA) Range and falling (CHB) edge of the clock. The T/H driven 400MHz, -3d B Input Bandwidth input stages incorporate 400MHz (-3d B) input ampli-

On-Chip 2.048V Precision Bandgap Reference

fiers. The converters may also be operated with single-

Single 10-Bit Bus for Multiplexed, Digital Outputs

ended inputs. In addition to low operating power, the

User-Selectable Output Format—Two’s

MAX1185 features a 2.8m A sleep mode as well as a

Complement or Offset Binary

1µA power-down mode to conserve power during idle

48-Pin TQFP Package with Exposed Pad for

periods.

Improved Thermal Dissipation

An internal 2.048V precision bandgap reference sets

Ordering Information

the full-scale range of the ADC. A flexible reference structure allows the use of this internal or an externally TEMP

PART PIN-PACKAGE

GN RE FN

derived reference, if desired for applications requiring RANGE

RE FP

increased accuracy or a different input voltage range.

RE FI MAX1185ECM -40°C to +85°C 48 TQFP-EP*

The MAX1185 features parallel, multiplexed, CMOS- GN RE FO UT

MAX1185ECM+ -40°C to +85°C 48 TQFP-EP*

compatible three-state outputs. The digital output for- T/ D9 A/

SL EE D8 A/ MAX1185ECM/V+ -40°C to +85°C 48 TQFP-EP*

mat can be set to two’s complement or straight offset

PD D7 A/ *EP = Exposed pad.

binary through a single control pin. The device provides

OE D6 A/ +Denotes a lead(Pb)-free/Ro HS-compliant package.

for a separate output power supply of 1.7V to 3.6V for

N. C. D5 A/ /V denotes an automotive qualified part.

flexible interfacing. The MAX1185 is available in a 7mm N. C. D4 A/

Pin-Compatible Versions table at end of data sheet.

x 7mm, 48-pin TQFP package, and is specified for the N. C. D3 A/

D2 A/ Pin Configuration

extended industrial (-40°C to +85°C) temperature N. C.

range. Pin-compatible, nonmultiplexed. high-speed versions of the MAX1185 are also available. Refer to the MAX1180 data sheet for 105Msps, the MAX1181 data sheet for

COM D1A/B

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

VDD D0A/B

MAX1183 data sheet for 40Msps, and the MAX1184

GND OGND

data sheet for 20Msps.

INA+ OVDD INA- OVDD VDD OGND

GND MAX1185 A/B

Applications

INB- N.C. High Resolution Imaging INB+ N.C. GND N.C.

I/Q Channel Digitization EP

VDD N.C. CLK N.C.

Multichannel IF Sampling Instrumentation Video Application Ultrasound 48 TQFP-EP

NOTE: THE PIN 1 INDICATOR FOR LEAD-FREE PACKAGES IS REPLACED BY A "+" SIGN.

Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.