MAXIM MAX1184 Technical data

General Description

The MAX1184 is a 3V, dual 10-bit analog-to-digital converter (ADC) featuring fully-differential wideband trackand-hold (T/H) inputs, driving two pipelined, 9-stage ADCs. The MAX1184 is optimized for low-power, highdynamic performance applications in imaging, instrumentation, and digital communication applications. This ADC operates from a single 2.7V to 3.6V supply, consuming only 105mW while delivering a typical signal-tonoise 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 powerdown 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 single control pin. The device provides for a separate output 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 multiplexed 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

Pin Configuration

19-2174; Rev 1; 7/06

Ordering Information

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.

PART TEMP RANGE PIN-PACKAGE

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

REFN

REFP

REFIN

REFOUT

D9A

D8A

D7A

D6A

D5A

D4A

D3A

D2A

COM

V GND INA+ INA-

V GND INBINB+ GND

CLK

4847464544434241403938

1314151617181920212223

GND

MAX1184

T/B

GND

48 TQFP-EP

SLEEP

D9B

D8B

D7B

D6B

D1A D0A

OGND

D0B

D1B

D2B

D3B

D4B

D5B

MAX1184

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(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, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 1), f

CLK

= 20MHz, TA= T

MIN

to T

MAX

unless otherwise noted. Typical values are at T

= +25°C.) (Note 2)

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.

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 V

REFIN, REFOUT, REFP, REFN, CLK,

COM to GND ..........................................-0.3V to (V

+ 0.3V)

OE, PD, SLEEP, T/B, D9A–D0A,

D9B–D0B to OGND .............................-0.3V to (OV

+ 0.3V)

Continuous Power Dissipation (T

= +70°C) 48-Pin TQFP-EP (derate 30.4mW/°C above

+70°C).......................................................................2430mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ACCURACY

Resolution 10 Bits

Integral Nonlinearity INL fIN = 7.5MHz ±0.5 ±1.5 LSB

Differential Nonlinearity DNL fIN = 7.5MHz, no missing codes guaranteed ±0.25 ±1.0 LSB Offset Error < ±1 ±1.8 % FS Gain Error 0 ±2 % FS

ANALOG INPUT

Differential Input Voltage Range

Common-Mode Input Voltage Range

Input Resistance R

Input Capacitance C

CONVERSION RATE

Maximum Clock Frequency f

Data Latency 5

DYNAMIC CHARACTERISTICS

Signal-to-Noise Ratio (Note 3)

Signal-to-Noise and Distortion (Note 3)

Spurious-Free Dynamic Range (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CLK

SNR

SINAD

SFDR

DIFF

Differential or single-ended inputs ±1.0 V

Switched capacitor load 100 kΩ

= 7.5MHz, TA = +25°C 57.3 59.5

INA or B

= 12MHz 59.4

INA or B

= 7.5MHz, TA = +25°C 57 59.4

INA or B

= 12MHz 59.2

INA or B

= 7.5MHz, TA = +25°C 64 74

INA or B

= 12MHz 72

INA or B

VDD/2

± 0.5

5pF

20 MHz

Clock

Cycles

dBc

MAX1184

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

Internal Reference and Parallel Outputs

_______________________________________________________________________________________ 3

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, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 1), f

CLK

= 20MHz, TA= T

MIN

to T

MAX

unless otherwise noted. Typical values are at T

= +25°C.) (Note 2)

Third-Harmonic Distortion (Note 3)

Total Harmonic Distortion (First 4 harmonics) (Note 3)

Intermodulation Distortion IMD

Small-Signal Bandwidth Input at -20dBFS, differential inputs 500 MHz

Full-Power Bandwidth FPBW Input at -0.5dBFS, differential inputs 400 MHz

Aperture Delay t

Aperture Jitter t

Overdrive Recovery Time For 1.5 x full-scale input 2 ns Differential Gain ±1% Differential Phase ±0.25 d egr ees

Output Noise INA+ = INA- = INB+ = INB- = COM 0.2 LSB

INTERNAL REFERENCE

Reference Output Voltage REFOUT

Reference Temperature Coefficient

Load Regulation 1.25 mV/mA

BUFFERED EXTERNAL REFERENCE (V

REFIN Input Voltage V

Positive Reference Output Voltage

Negative Reference Output Voltage

Differential Reference Output Voltage Range

REFIN Resistance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

HD3

THD

REFIN

REFP

REFN

∆V

REFIN

INA or B

I N A o r B

REF

= 2.048V)

REFIN

∆V

REF

= 7.5MHz -74

= 12MHz -72

= 7.5MHz, TA = +25°C -72 -64

= 12MHz -71

= 11.985MHz at -6.5dBFS

= 12.893M H z at - 6.5d BFS ( N ote 4)

REF

= V

REFP

- V

REFN

-76 dBc

1ns

2ps

2.048

±3%

60 ppm/°C

2.048 V

2.012 V

0.988 V

0.95 1.024 1.10 V

>50 MΩ

dBc

RMS

MAX1184

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

4 _______________________________________________________________________________________

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, V

= 2V

P-P

(differential with respect to. COM), CL= 10pF at digital outputs (Note 1), f

CLK

= 20MHz, TA= T

MIN

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

Maximum REFP, COM Source Current

Maximum REFP, COM Sink Current

Maximum REFN Source Current I

Maximum REFN Sink Current I

UNBUFFERED EXTERNAL REFERENCE (V

REFP, REFN Input Resistance

Differential Reference Input Voltage

COM Input Voltage V

REFP Input Voltage V

REFN Input Voltage V

DIGITAL INPUTS (CLK, PD, OE, SLEEP, T/B))

Input High Threshold V

Input Low Threshold V

Input Hysteresis V

Input Leakage

Input Capacitance C

DIGITAL OUTPUTS (D9A–D0A, D9B–D0B)

Output Voltage Low V

Output Voltage High V

Three-State Leakage Current I

Three-State Output Capacitance C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SOURCE

SINK

SOURCE

SINK

REFP

REFN

∆V

REF

COM

REFP

REFN

HYST

LEAK

OUT

= AGND, reference voltage applied to REFP, REFN, and COM)

REFIN

Measured between REFP and COM, and REFN and COM

∆V

REF

= V

REFP

- V

REFP

CLK 0.8 x V PD, OE, SLEEP, T/B 0.8 x OV

CLK 0.2 x V PD, OE, SLEEP, T/B 0.2 x OV

VIH = OV

or V

(CLK) ±5

VIL = 0V ±5

= 200µA 0.2 V

SINK

SOURCE

OE = OV OE = OV

= 200µA OVDD - 0.2 V

5mA

-250 µA

250 µA

-5 mA

4kΩ

1.024 ±10%

VDD/2

±10%

C OM

∆V

/ 2

RE F

C OM

∆V

/ 2

RE F

0.1 V

5pF

±10 µA

5pF

µA

MAX1184

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

Internal Reference and Parallel Outputs

_______________________________________________________________________________________ 5

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, V

= 2V

P-P

(differential with respect to. COM), CL= 10pF at digital outputs (Note 1), f

CLK

= 20MHz, TA= T

MIN

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

Note 1: Equivalent dynamic performance is obtainable over full OVDDrange with reduced CL. Note 2: Specifications at ≥ +25°C are guaranteed by production test and < +25°C are guaranteed by design and characterization. Note 3: SNR, SINAD, THD, SFDR, and HD3 are based on an analog input voltage of -0.5dBFS referenced to a 1.024V full-scale

input voltage range.

Note 4: Intermodulation distortion is the total power of the intermodulation products relative to the individual carrier. This number is

6dB or better, if referenced to the two-tone envelope.

Note 5: Digital outputs settle to V

, VIL. Parameter guaranteed by design.

Note 6: With REFIN driven externally, REFP, COM, and REFN are left floating while powered down.

POWER REQUIREMENTS

Analog Supply Voltage Range V

Output Supply Voltage Range OV

Analog Supply Current I

Output Supply Current I

Power Dissipation PDISS

Power-Supply Rejection Ratio PSRR

TIMING CHARACTERISTICS

CLK Rise to Output Data Valid t

Output Enable Time t

Output Disable Time t

CLK Pulse Width High t

CLK Pulse Width Low t

Wake-Up Time t

CHANNEL-TO-CHANNEL MATCHING

Crosstalk f

Gain Matching f

Phase Matching f

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VDD

OVDD

ENABLE

DISABLE

WAKE

Operating, f

Sleep mode 2.8 Shutdown, clock idle, PD = OE = OV

Operating, CL = 15pF, f

-0.5dBFS

Sleep mode 100 Shutdown, clock idle, PD = OE = OV

Operating, f

Sleep mode 8.4 Shutdown, clock idle, PD = OE = OV Offset ±0.2 mV/V Gain ±0.1 %/V

Figure 3 (Note 5) 5 8 ns

Figure 4 10 ns

Figure 4 1.5 ns

Figure 3, clock period: 50ns

Wake up from sleep mode (Note 6) 0.51

Wake up from shutdown (Note 6) 1.5

= 7.5MHz at -0.5dBFS -70 dB

INA or B

= 7.5MHz at -0.5dBFS 0.02 ±0.2 dB

INA or B

= 7.5MHz at -0.5dBFS 0.25 d eg r ees

INA or B

= 7.5MHz at -0.5dBFS 35 50

INA or B

= 7.5MHz at

INA or B

= 7.5MHz at -0.5dBFS 105 150

INA or B

2.7 3.0 3.6 V

1.7 2.5 3.6 V

115µA

3.8 mA

210

345µW

25 ± 7.5 25 ± 7.5

µA

µs

MAX1184

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

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= 3V, OVDD= 2.5V, V

REFIN

= 2.048V, differential input at -0.5dBFS, f

CLK

= 20MHz, CL≈ 10pF, TA= +25°C, unless otherwise noted.)

FFT PLOT CHA (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

= 20.0006MHz

CLK

-10

= 5.9743MHz

INA

= 7.5344MHz

INB

-20

= -0.525dBFS

INA

-30

-40

-50

-60

HD3

AMPLITUDE (dB)

-70

-80

-90

-100 0 23415679810

ANALOG INPUT FREQUENCY (MHz)

FFT PLOT CHB (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

= 20.0006MHz

CLK

-10

= 7.5344MHz

INA

= 11.9852MHz

INB

-20

= -0.471dBFS

INB

-30

-40

-50

-60

AMPLITUDE (dB)

-70

-80

-90

-100 0 2341 567 9810

HD3

HD2

ANALOG INPUT FREQUENCY (MHz)

HD2

CHA

CHB

MAX1184 toc01

MAX1184 toc04

FFT PLOT CHB (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

= 20.0006MHz

CLK

-10

= 5.9743MHz

INA

= 7.5244MHz

INB

-20

= -0.462dBFS

INB

-30

-40

-50

-60

AMPLITUDE (dB)

HD3

-70

-80

-90

-100 0 2341 567 9810

HD2

ANALOG INPUT FREQUENCY (MHz)

TWO-TONE IMD PLOT DIFFERENTIAL

INPUT, 8192-POINT DATA RECORD

= 20.0006MHz

CLK

-10

= 11.9852MHz

IN1

= 12.8934MHz

IN2

-20

= A

= -6.5dBFS

IN1

-30

-40

-50

-60

AMPLITUDE (dB)

-70

-80

-90

-100

IN2

IM2

046821012141816 20

ANALOG INPUT FREQUENCY (MHz)

IM3

CHB

IM3

FFT PLOT CHA (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

= 20.0006MHz

CLK

MAX1184 toc02

-10

= 7.5344MHz

INA

= 11.9852MHz

INB

-20

= -0.489dBFS

INA

-30

-40

-50

-60

AMPLITUDE (dB)

-100

HD3

-70

-80

-90

0 2341 567 9810

HD2

ANALOG INPUT FREQUENCY (MHz)

CHA

MAX1184 toc03

SIGNAL-TO-NOISE RATIO vs. ANALOG INPUT FREQUENCY

MAX1184 toc05

IN1

CHB

SNR (dB)

CHA

0 1020304050

ANALOG INPUT FREQUENCY (MHz)

MAX1184 toc06

SIGNAL-TO-NOISE PLUS DISTORTION

vs. ANALOG INPUT FREQUENCY

SINAD (dB)

0 10203040 50

CHB

CHA

ANALOG INPUT FREQUENCY (MHz)

MAX1184 toc07

TOTAL HARMONIC DISTORTION vs.

ANALOG INPUT FREQUENCY

-63

-65

-67

-69

THD (dBc)

-71

-73

-75

-77 0 10203040 50

CHB

CHA

ANALOG INPUT FREQUENCY (MHz)

MAX1184 toc08

SPURIOUS-FREE DYNAMIC RANGE vs.

ANALOG INPUT FREQUENCY

SFDR (dBc)

CHB

01020304050

ANALOG INPUT FREQUENCY (MHz)

MAX1184 toc09

CHA

MAX1184

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

Internal Reference and Parallel Outputs

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VDD= 3V, OVDD= 2.5V, V

REFIN

= 2.048V, differential input at -0.5dBFS, f

CLK

= 20MHz, CL≈ 10pF, TA= +25°C, unless otherwise noted.)

FULL-POWER INPUT BANDWIDTH vs.

ANALOG INPUT FREQUENCY, SINGLE-ENDE

GAIN (dB)

-2

-4

-6

-8 1 10 100 1000

ANALOG INPUT FREQUENCY (MHz)

SIGNAL-TO-NOISE PLUS DISTORTION vs.

ANALOG INPUT POWER (f

SINAD (dB)

SMALL-SIGNAL INPUT BANDWIDTH vs.

ANALOG INPUT FREQUENCY, SINGLE-ENDE

GAIN (dB)

-2

-4

-6

-8 1 10 100 1000

ANALOG INPUT FREQUENCY (MHz)

TOTAL HARMONIC DISTORTION vs.

ANALOG INPUT POWER (f

-58

-62

-66

THD (dBc)

-70

-74

= 7.5344MHz)

MAX1184 toc10

MAX1184 toc13

VIN = 100mV

SIGNAL-TO-NOISE RATIO vs.

ANALOG INPUT POWER (f

MAX1184 toc11

SNR (dB)

-20 0

-12-16 -8 -4

ANALOG INPUT POWER (dBFS)

P-P

= 7.5344MHz)

SPURIOUS-FREE DYNAMIC RANGE vs.

= 7.5344MHz)

MAX1184 toc14

SFDR (dBc)

ANALOG INPUT POWER (f

100

= 7.5344MHz)

MAX1184 toc12

MAX1184 toc15

-20 0

-12-16 -8 -4

ANALOG INPUT POWER (dBFS)

INTEGRAL NONLINEARITY

0.3

0.2

0.1

INL (LSB)

-0.1

-0.2

-0.3 0 256128 384 512 640 768 896 1024

DIGITAL OUTPUT CODE

MAX1184 toc16

-78

-20 -12-16 -8 -4 0 ANALOG INPUT POWER (dBFS)

DIFFERENTIAL NONLINEARITY

0.3

0.2

0.1

DNL (LSB)

-0.1

-0.2

-0.3 0256128 384 512 640 768 896 1024

DIGITAL OUTPUT CODE

0.6

0.5

MAX1184 toc17

0.4

0.3

0.2

GAIN ERROR (%FS)

0.1

-0.1

-20 -12-16 -8 -4 0 ANALOG INPUT POWER (dBFS)

GAIN ERROR vs. TEMPERATURE

CHB

CHA

-40 85

10-15 35 60

TEMPERATURE (°C)

MAX1184 toc18

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