Rainbow Electronics MAX1197 User Manual

General Description

The MAX1197 is a 3V, dual, 8-bit analog-to-digital con­verter (ADC) featuring fully differential wideband track­and-hold (T/H) inputs, driving two ADCs. The MAX1197
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
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 ampli­fiers. The converters may also be operated with single­ended 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 three­state outputs. The digital output format can be 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 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 inter­leaved 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 fIN= 30MHz/200MHz

♦ -72dB Interchannel Crosstalk at fIN= 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

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*

REFN

REFP

REFIN

REFOUT

D7A

D6A

D5A

D4A

D3A

D2A

D1A

D0A

COM

V
GND
INA+
INA-

V
GND
INB­INB+
GND

V

CLK

4847464544434241403938

1

2

DD

3

4

5

6

DD

7

8

9

10

11

DD

12

1314151617181920212223

GND

MAX1197

DD

DD

V

V

GND

TQFP-EP

OE

PD

T/B

SLEEP

D7B

D6B

D5B

37

24

D4B

36

N.C.
N.C.

35

OGND

34

OV

33

DD

OV

32

DD

OGND

31

N.C.

30

N.C.

29

D0B

28

D1B

27

D2B

26

D3B

25

MAX1197

Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with
Internal Reference and Parallel Outputs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ
resistor, V

IN

= 2V

P-P

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

CLK

= 60MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization. Typical values are at T

A

= +25°C.)

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, OVDDto GND ...............................................-0.3V to +3.6V

OGND to GND.......................................................-0.3V to +0.3V

INA+, INA-, INB+, INB- to GND ...............................-0.3V to V

DD

REFIN, REFOUT, REFP, REFN,

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

DD

+ 0.3V)

OE, PD, SLEEP, T/B, D7A–D0A,

D7B–D0B to OGND .............................-0.3V to (OV

DD

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

48-Pin TQFP (derate 12.5mW/°C above +70°C).........1000mW

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 8 Bits

Integral Nonlinearity INL fIN = 7.5MHz (Note 1) ±0.3 ±1 LSB

Differential Nonlinearity DNL

Offset Error ±4%FS
Gain Error ±4%FS
Gain Temperature Coefficient ±100 ppm/°C

ANALOG INPUT

Differential Input Voltage Range V

Common-Mode Input Voltage
Range

Input Resistance R

Input Capacitance C

CONVERSION RATE

Maximum Clock Frequency f

Data Latency 5

DYNAMIC CHARACTERISTICS (f

Signal-to-Noise Ratio SNR

PARAMETER SYMBOL CONDITIONS MIN T YP MAX UNITS

f

= 7.5MHz, no missing codes guaranteed

IN

(Note 1)

DIFF

V

CM

CLK

= 60MHz, 4096-point FFT)

CLK

Differential or single-ended inputs ±1.0 V

Switched capacitor load 95 kΩ

IN

IN

f

= 7.5MHz at -1dB FS 48.7

INA or B

f

= 20MHz at -1dB FS 47 48.7

INA or B

f

= 30MHz at -1dB FS 48.6

INA or B

f

= 115.1MHz at -1dB FS 48.3

INA or B

±0.2 ±1 LSB

V

D D

±0.2

60 MHz

/ 2

5pF

V

Clock

Cycles

dB

MAX1197

Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ
resistor, V

IN

= 2V

P-P

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

CLK

= 60MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization. Typical values are at T

A

= +25°C.)

Signal-to-Noise
and Distortion

Spurious-Free
Dynamic Range

Third-Harmonic
Distortion

Intermodulation Distortion
(First Five Odd-Order IMDs)

Third-Order Intermodulation
Distortion

Total Harmonic Distortion
(First Four Harmonics)

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

Full-Power Bandwidth FPBW Input at -1dB FS, differential inputs 400 MHz

Gain Flatness
(12MHz Spacing)

Aperture Delay t

Aperture Jitter t
Overdrive Recovery Time For 1.5 × full-scale input 2 ns
IN T ER N A L REF ER EN C E ( RE FIN = RE FOU T thr oug h 10kΩ r esi stor ; RE FP , RE FN , and C OM l evel s ar e g ener ated i nter nal l y.)

Reference Output Voltage V

Positive Reference Output
Voltage

Negative Reference Output
Voltage

Common-Mode Level V

PARAMETER SYMBOL CONDITIONS MIN T YP MAX UNITS

f

= 7.5MHz at -1dB FS 48.6

INA or B

f

= 20MHz at -1dB FS 46.5 48.6

SINAD

SFDR

HD3

IMD

INA or B

f

= 30MHz at -1dB FS 48.5

INA or B

f

= 115.1MHz at -1dB FS 48.2

INA or B

f

= 7.5MHz at -1dB FS 71

INA or B

f

= 20MHz at -1dB FS 60 69

INA or B

f

= 30MHz at -1dB FS 69

INA or B

= 115.1MHz at -1dB FS 68

f

INA or B

f

= 7.5MHz at -1dB FS - 75

INA or B

f

= 20MHz at -1dB FS - 72

INA or B

f

= 30MHz at -1dB FS - 72

INA or B

= 115.1MHz at -1dB FS - 68

f

INA or B

f

IN1(A or B)

f

IN2(A or B)

= 1.985MHz at -7dB FS
= 2.029MHz at -7dB FS

- 70 dBc

dB

dBc

dBc

(Note 2)

IM3

f

IN1(A or B)

f

IN2(A or B)

= 1.985MHz at -7dB FS
= 2.029MHz at -7dB FS

- 71.8 dBc

(Note 2)

f

= 7.5MHz at -1dB FS - 69

INA or B

f

= 20MHz at -1dB FS - 67 - 57

THD

INA or B

f

= 30MHz at -1dB FS - 67

INA or B

= 115.1MHz at -1dB FS - 65

f

INA or B

f

IN1(A or B)

f

IN2(A or B)

= 106 MHz at -1dB FS
= 118 MHz at -1dB FS

0.05 dB

dBc

(Note 3)

AD

AJ

REFOUT

V

REFP

V

REFN

COM

1dB SNR degradation at Nyquist 2 ps

(Note 4)

(Note 5) 2.012 V

(Note 5) 0.988 V

(Note 5)

1ns

2.048
± 3%

V

/ 2

D D

±0.1

RMS

V

V

MAX1197

Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with
Internal Reference and Parallel Outputs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ
resistor, V

IN

= 2V

P-P

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

CLK

= 60MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization. Typical values are at T

A

= +25°C.)

Differential Reference Output
Voltage Range

Reference Temperature
Coefficient

BUFFERED EXTERNAL REFERENCE (V

Positive Reference Output
Voltage

Negative Reference Output
Voltage

Common-Mode Level V

Differential Reference Output
Voltage Range

REFIN Resistance R

Maximum REFP, COM Source
Current

Maximum REFP, COM Sink
Current

Maximum REFN Source Current I

Maximum REFN Sink Current I

U N B U F F ER ED EXT ER N A L R EF ER EN C E ( V

REFP, REFN Input Resistance

REFP, REFN, COM Input
Capacitance

Differential Reference Input
Voltage Range

COM Input Voltage Range V

REFP Input Voltage V

REFN Input Voltage V

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

Input High Threshold V

PARAMETER SYMBOL CONDITIONS MIN T YP MAX UNITS

∆V

TC

V

REFP

V

REFN

COM

∆V

REFIN

I

SOURCE

I

SINK

SOURCE

SINK

R

REFP

R

REFN

C

∆V

COM

REFP

REFN

∆V

REF

REF

REFIN

= V

REF

= 2.048V)

REFP

- V

REFN

(Note 5) 2.012 V

(Note 5) 0.988 V

(Note 5)

∆V

REF

RE F IN

,

= V

REF

= AGN D , r efer ence vol tag e ap p l i ed to RE FP , RE FN , and C OM )

Measured between REFP, COM, REFN,

REFP

- V

REFN

and COM

IN

∆V

REF

REF

= V

REFP

- V

REFN

CLK

IH

PD, OE, SLEEP, T/B

0.8 ×

V

0.8 ×

OV

1.024

± 3%

±100 ppm/°C

V

/ 2

D D

± 0.1

1.024

± 2%

750 MΩ

5mA

- 250 µA

250 µA

- 5mA

4kΩ

15 pF

1.024

±10%

V

/ 2

D D

±5%

V

+

C OM

∆V

/ 2

RE F

V

-

C OM

∆V

/ 2

RE F

DD

DD

V

V

V

V

V

V

V

V

MAX1197

Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ
resistor, V

IN

= 2V

P-P

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

CLK

= 60MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization. Typical values are at T

A

= +25°C.)

Input Low Threshold V

Input Hysteresis V

Input Leakage

Input Capacitance C

DIGITAL OUTPUTS (D7A–D0A, D7B–D0B)

Output Voltage Low V

Output Voltage High V

Three-State Leakage Current I

Three-State Output Capacitance C

POWER REQUIREMENTS

Analog Supply Voltage Range V

Output Supply Voltage Range OV

Analog Supply Current I

Output Supply Current I

Analog Power Dissipation PDISS

Power-Supply
Rejection

TIMING CHARACTERISTICS

CLK Rise to Output Data Valid
Time

OE Fall to Output Enable Time t
OE Rise to Output Disable Time t

CLK Pulse Width High t

CLK Pulse Width Low t

PARAMETER SYMBOL CONDITIONS MIN T YP MAX UNITS

CLK

IL

PD, OE, SLEEP, T/B

HYST

I

I

OH

LEAK

OUT

VIH = VDD = OV

IH

VIL = 0 ±20

IL

IN

I

OL

= -200µA 0.2 V

SINK

I

SOURCE

OE = OV
OE = OV

DD

CL = 15pF 1.7 3 3.6 V

DD

Operating, f

= 200µA

DD

DD

INA & B

DD

= 20MHz at

-1dB FS applied to both channels

VDD

Sleep mode 3
Shutdown, clock idle, PD = OE = OV

Operating, f

INA & B

= 20MHz at

-1dB FS applied to both channels (Note 6)

OVDD

Sleep mode 3
Shutdown, clock idle, PD = OE = OV

Operating, f

INA & B

= 20MHz at

-1dB FS applied to both channels

DD

DD

0.2 ×

V

DD

0.2 ×

OV

DD

0.15 V

±20

5pF

OV

DD

- 0.2

±10 µA

5pF

2.7 3 3.6 V

40 50

0.1 20 µA

9mA

310

120 150

Sleep mode 9

0.3 60 µW

mV/V

5ns

5ns

PSRR

t

DO

ENABLE

DISABLE

CH

CL

Shutdown, clock idle, PD = OE = OV

DD

Offset, VDD ±5% ±3

Gain, V

±5% ±3

DD

CL = 20pF (Notes 1, 7) 6 9 ns

Clock period: 16.67ns (Note 7) 8.33 ± 1.5 ns

Clock period: 16.67ns (Note 7) 8.33 ± 1.5 ns

V

µA

V

mA

µA

mW

MAX1197

Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with
Internal Reference and Parallel Outputs

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ
resistor, V

IN

= 2V

P-P

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

CLK

= 60MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization. Typical values are at T

A

= +25°C.)

Note 1: Guaranteed by design. Not subject to production testing.
Note 2: Intermodulation distortion is the total power of the intermodulation products relative to the total input power.
Note 3: Analog attenuation is defined as the amount of attenuation of the fundamental bin from a converted FFT between two

applied input signals with the same magnitude (peak-to-peak) at f

IN1

and f

IN2

.

Note 4: REFIN and REFOUT should be bypassed to GND with a 0.1µF (min) and 2.2µF (typ) capacitor.
Note 5: REFP, REFN, and COM should be bypassed to GND with a 0.1µF (min) and 2.2µF (typ) capacitor.
Note 6: Typical analog output current at f

INA&B

= 20MHz. For digital output currents vs. analog input frequency,

see Typical Operating Characteristics.

Note 7: See Figure 3 for detailed system timing diagrams. Clock to data valid timing is measured from 50% of the clock

level to 50% of the data output level.

Note 8: Crosstalk rejection is tested by applying a test tone to one channel and holding the other channel at DC level.

Crosstalk is measured by calculating the power ratio of the fundamental of each channel’s FFT.

Note 9: Amplitude matching is measured by applying the same signal to each channel and comparing the magnitude of the funda-

mental of the calculated FFT.

Note 10: Phase matching is measured by applying the same signal to each channel and comparing the phase of the fundamental

of the calculated FFT. The data from both ADC channels must be captured simultaneously during this test.

Note 11: SINAD settles to within 0.5dB of its typical value in unbuffered external reference mode.

Wake-Up Time t

CHANNEL-TO-CHANNEL MATCHING

Crosstalk f

Gain Matching f

Phase Matching f

PARAMETER SYMBOL CONDITIONS MIN T YP MAX UNITS

WAKE

Wake up from sleep mode 1

Wake up from shutdown mode (Note 11) 20

= 20MHz at -1dB FS (Note 8) - 72 dB

INA or B

= 20MHz at -1dB FS (Note 9) 0.05 dB

INA or B

= 20MHz at -1dB FS (Note 10) ± 0.05 Degrees

INA or B

µs

MAX1197

Dual, 8-Bit, 60Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

_______________________________________________________________________________________ 7

Typical Operating Characteristics

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

REFIN

= 2.048V, differential input at -1dB FS, f

CLK

= 40MHz, CL≈ 10pF TA= +25°C, unless otherwise

noted.)

FFT PLOT CHA (DIFFERENTIAL INPUT,

FFT PLOT CHA (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

0

-10

-20

-30

-40

-50

AMPLITUDE (dB)

-60

-70

-80

-90

ANALOG INPUT FREQUENCY (MHz)

f

CLK

f

INA

f

INB

AIN = -1dB FS
COHERENT SAMPLING

f

INA

HD2

= 60.056789MHz
= 7.4851051MHz
= 19.9333995MHz

HD3

252015105030

TWO-TONE IMD PLOT (DIFFERENTIAL INPUT,

f

INB

0

f

CLK

-10

f

MAX1197 toc01

INA

f

INB

-20
AIN = -1dB FS

COHERENT SAMPLING

-30

-40

-50

AMPLITUDE (dB)

-60

-70

-80

-90

030

TWO-TONE IMD PLOT (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

MAX1197 toc04

0

f

CLK

-10

= 9.969325MHz

f

IN1

= 10.013275MHz

f

IN2

-20

AIN = -7dB FS
COHERENT SAMPLING

-30

-40

-50

AMPLITUDE (dB)

-60

-70

-80

-90

6

0

-10

-20

-30

-40

-50

AMPLITUDE (dB)

-60

-70

-80

-90

05.0

f

ANALOG INPUT FREQUENCY (MHz)

IN1

f

= 60.00640MHz

CLK

= 1.985075MHz

f

IN1

= 2.029025MHz

f

IN2

AIN = -7dB FS
COHERENT SAMPLING

f

IN2

4.54.03.0 3.51.0 1.5 2.0 2.50.5

8192-POINT DATA RECORD)

= 60.056789MHz
= 29.859778MHz
= 19.9333995MHz

HD2

ANALOG INPUT FREQUENCY (MHz)

8192-POINT DATA RECORD)

= 60.00640MHz

ANALOG INPUT FREQUENCY (MHz)

f

INB

f

IN1

f

IN2

FFT PLOT CHA (DIFFERENTIAL INPUT,

8192-POINT DATA RECORD)

255101520

f

HD3

0

-10

MAX1197 toc02

-20

-30

INA

-40

-50

AMPLITUDE (dB)

-60

-70

-80

-90

ANALOG INPUT FREQUENCY (MHz)

f

INA

HD2

f

= 60.056789MHz

CLK

= 114.974441MHz

f

INA

= 99.945816MHz

f

INB

AIN = -1dB FS
COHERENT SAMPLING

f

INB

HD3

255101520030

SIGNAL-TO-NOISE RATIO

vs. ANALOG INPUT FREQUENCY

50

MAX1197 toc05

49

48

SNR (dB)

47

46

1412 138 9 10 117

45

0 200

ANALOG INPUT FREQUENCY (MHz)

CHA

CHB

1601208040

MAX1197 toc03

MAX1197 toc06

SIGNAL-TO-NOISE + DISTORTION

vs. ANALOG INPUT FREQUENCY

50

49

48

SINAD (dB)

47

46

45

0 200

ANALOG INPUT FREQUENCY (MHz)

CHB

CHA

TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT FREQUENCY

-40

MAX1197 toc07

-50

CHB

-60

THD (dBc)

-70

-80

1601208040

-90
0 200

ANALOG INPUT FREQUENCY (MHz)

CHA

1601208040

MAX1197 toc08

SPURIOUS-FREE DYNAMIC RANGE

vs. ANALOG INPUT FREQUENCY

90

80

70

SFDR (dBc)

60

50

40

CHB

CHA

0 200

ANALOG INPUT FREQUENCY (MHz)

MAX1197 toc09

1601208040