Rainbow Electronics MAX1207 User Manual

General Description

The MAX1207 is a 3.3V, 12-bit analog-to-digital converter
(ADC) featuring a fully differential wideband track-and­hold (T/H) input, driving the internal quantizer. The
MAX1207 is optimized for low power, small size, and
high dynamic performance. This ADC operates from a
single 3.0V to 3.6V supply, consuming only 316mW,
while delivering a typical signal-to-noise ratio (SNR) per­formance of 68.5dB at a 32.5MHz input frequency. The
T/H-driven input stage accepts single-ended or differen­tial inputs. In addition to low operating power, the
MAX1207 features a 0.15mW power-down mode to con­serve power during idle periods.

A flexible reference structure allows the MAX1207 to
use its internal precision bandgap reference or accept
an externally applied reference. A common-mode refer­ence is provided to simplify design and reduce external
component count in differential analog input circuits.

The MAX1207 supports both a single-ended and differ­ential input clock drive. Wide variations in the clock
duty cycle are compensated with the ADC’s internal
duty-cycle equalizer.

The MAX1207 features parallel, CMOS-compatible out­puts. The digital output format is pin selectable to be
either two’s complement or Gray code. A data-valid indi­cator eliminates external components that are normally
required for reliable digital interfacing. A separate power
input for the digital outputs accepts a voltage from 1.7V
to 3.6V for flexible interfacing with various logic levels.
The MAX1207 is available in a 6mm x 6mm x 0.8mm, 40­pin thin QFN package with exposed paddle (EP), and is
specified for the extended industrial (-40°C to +85°C)
temperature range.

Refer to the MAX1209 and MAX1211 (see Pin Compatible
Higher/Lower Speed Versions table) for applications
that require high dynamic performance for IF input fre­quencies.

Applications

Communication Receivers

Cellular, LMDS, Point-to-Point Microwave,
MMDS, HFC, WLAN

Ultrasound and Medical Imaging

Portable Instrumentation

Low-Power Data Acquisition

Features

♦ Excellent Dynamic Performance

68.5dB SNR at fIN= 32.5MHz

88.7dBc SFDR at fIN= 32.5MHz

♦ 3.3V Low-Power Operation

316mW (Single-Ended Clock Mode)
342mW (Differential Clock Mode)

♦ Differential or Single-Ended Clock

♦ Accepts 20% to 80% Clock Duty Cycle

♦ Fully Differential or Single-Ended Analog Input

♦ Adjustable Full-Scale Analog Input Range

♦ Common-Mode Reference

♦ Power-Down Mode

♦ CMOS-Compatible Outputs in Two’s Complement

or Gray Code

♦ Data-Valid Indicator Simplifies Digital Design

♦ Out-of-Range and Data-Valid Indicators

♦ Miniature, 40-Pin Thin QFN Package with Exposed

Paddle

♦ Pin-Compatible, IF Sampling ADC Available

(MAX1211ETL)

♦ Evaluation Kit Available (Order MAX1211EVKIT)

MAX1207

65Msps, 12-Bit ADC

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3260; Rev 0; 5/04

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.

EVALUATION KIT

AVAILABLE

PART

PIN-PACKAGE

40 Thin QFN (6mm x 6mm)

Pin-Compatible Higher/Lower

Speed Versions

PART

SPEED GRADE

(Msps)

TARGET

APPLICATION

MAX1206 40 Baseband

MAX1207 65 Baseband

MAX1208 80 Baseband

MAX1211 65 IF

MAX1209 80 IF

Pin Configuration appears at end of data sheet.

TEMP RANGE

MAX1207ETL -40°C to +85°C

MAX1207

65Msps, 12-Bit ADC

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

VDDto GND...........................................................-0.3V to +3.6V

OV

DD

to GND........-0.3V to the lower of (VDD+ 0.3V) and +3.6V

INP, INN to GND ...-0.3V to the lower of (V

DD

+ 0.3V) and +3.6V

REFIN, REFOUT, REFP, REFN,

COM to GND.....-0.3V to the lower of (V

DD

+ 0.3V) and +3.6V

CLKP, CLKN, CLKTYP, G/

T, DCE,

PD to GND ........-0.3V to the lower of (V

DD

+ 0.3V) and +3.6V

D11–D0, I. C., DAV, DOR to GND ...........-0.3V to (OV

DD

+ 0.3V)

Continuous Power Dissipation (TA= +70°C)

40-Pin Thin QFN 6mm x 6mm x 0.8mm

(derated 26.3mW/°C above +70°C)........................2105.3mW

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

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

Storage Temperature Range .............................-65°C to +150°C

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

ELECTRICAL CHARACTERISTICS

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN=

-0.5dBFS, CLKTYP = high, DCE = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DC ACCURACY

Resolution 12 Bits

Integral Nonlinearity INL fIN = 20MHz (Note 2)

LSB

Differential Nonlinearity DNL

f

IN

= 20MHz, no missing codes over

temperature (Note 2)

LSB

Offset Error V

REFIN

= 2.048V

Gain Error V

REFIN

= 2.048V

ANALOG INPUT (INP, INN)

Differential Input Voltage Range V

DIFF

Differential or single-ended inputs

V

Common-Mode Input Voltage

V

Input Resistance R

IN

Switched capacitor load 15 kΩ

Input Capacitance C

IN

4pF

CONVERSION RATE

Maximum Clock Frequency f

CLK

65

Minimum Clock Frequency 5

Data Latency Figure 5 8.5

DYNAMIC CHARACTERISTICS (Differential inputs, 4096-point FFT)

fIN = 3MHz at -0.5dBFS

Signal-to-Noise Ratio SNR

f

IN

= 32.5MHz at -0.5dBFS (Note 2)

dB

fIN = 3MHz at -0.5dBFS

Signal-to-Noise and Distortion SINAD

f

IN

= 32.5MHz at -0.5dBFS (Note 2)

dB

fIN = 3MHz at -0.5dBFS

Single-Tone Spurious-Free
Dynamic Range

SFDR

f

IN

= 32.5MHz at -0.5dBFS (Note 2)

dBc

fIN = 3MHz at -0.5dBFS

Total Harmonic Distortion

THD

fIN = 32.5MHz at -0.5dBFS (Note 2)

dBc

±0.4 ±0.7

±0.3 ±0.7

67.1 68.5

67.0 68.4

82.2 88.7

±0.2 ±0.9 %FS

±0.3 ±4.9 %FS

±1.024

VDD / 2

68.5

68.4

90.4

-89.3

-86.4 -80.7

MHz

MHz

Clock

cycles

MAX1207

65Msps, 12-Bit ADC

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN=

-0.5dBFS, CLKTYP = high, DCE = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

fIN = 3MHz at -0.5dBFS

Second Harmonic

HD2

fIN = 32.5MHz at -0.5dBFS (Note 3)

dBc

fIN = 3MHz at -0.5dBFS

Third Harmonic HD3

f

IN

= 32.5MHz at -0.5dBFS (Note 3)

dBc

Third-Order Intermodulation IM3

f

IN1

= 69MHz at -7dBFS,

f

IN2

= 71MHz at -7dBFS

-90 dBc

Two-Tone Spurious-Free
Dynamic Range

f

IN1

= 69MHz at -7dBFS,

f

IN2

= 71MHz at -7dBFS

89 dBc

Aperture Delay t

AD

Figure 14 0.9 ns

Aperture Jitter t

AJ

Figure 14

Output Noise n

OUT

INP = INN = COM 0.5

Overdrive Recovery Time ±10% beyond full scale 1

Clock

INTERNAL REFERENCE (REFIN = REFOUT; V

REFP

, V

REFN

, and V

COM

are generated internally)

REFOUT Output Voltage

V

COM Output Voltage V

COM

V

DD

/ 2

V

Differential Reference
Output Voltage

V

REF

V

REF

= V

REFP

- V

REFN

V

REFOUT Load Regulation 35

REFOUT Temperature Coefficient

TC

REF

Short to V

DD

REFOUT Short-Circuit Current

Short to GND 2.1

mA

B U F F ER ED EXT ER N A L R EF ER EN C E ( RE FIN d r i ven exter nal l y, V

R E F IN

= 2.048V , V

R E F P

, V

R E F N

, and V

C OM

ar e g ener ated i nter nal l y)

REFIN Input Voltage V

REFIN

V

REFP Output Voltage V

REFP

(V

DD

/ 2) + (V

REFIN

/ 4)

V

REFN Output Voltage V

REFN

(V

DD

/ 2) - (V

REFIN

/ 4)

V

COM Output Voltage V

COM

V

DD

/ 2

V

Differential Reference
Output Voltage

V

REF

V

REF

= V

REFP

- V

REFN

V

Differential Reference
Temperature Coefficient

Source 0.4

Maximum REFP Current I

REFP

Sink 1.4

mA

Source 1.0

Maximum REFN Current I

REFN

Sink 1.0

mA

Source 1.0

Maximum COM Current I

COM

Sink 0.4

mA

REFIN Input Resistance

MΩ

SFDR

TT

V

REFOUT

-93.6

-89.4 -82.0

-96.8

-92.7 -84.3

<0.2 ps

1.988 2.048 2.080

1.65

1.024

+100 ppm/°C

0.24

2.048

2.162

1.138

1.60 1.65 1.70

0.970 1.024 1.070

+12.5 ppm/°C

>50

RMS

LSB

RMS

cycles

mV/mA

MAX1207

65Msps, 12-Bit ADC

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN=

-0.5dBFS, CLKTYP = high, DCE = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

UNBUFFERED EXTERNAL REFERENCE (REFIN = GND, V

REFP

, V

REFN

, and V

COM

are applied externally)

COM Input Voltage V

COM

V

DD

/ 2

V

REFP Input Voltage V

REFP

- V

COM

V

REFN Input Voltage V

REFN

- V

COM

V

Differential Reference Input
Voltage

V

REF

V

REF

= V

REFP

- V

REFN

V

REFP Sink Current I

REFP

V

REFP

= 2.162V 1.1 mA

REFN Source Current I

REFN

V

REFN

= 1.138V 1.1 mA

COM Sink Current I

COM

0.3 mA

REFP, REFN, Capacitance 13 pF

COM Capacitance 6pF

CLOCK INPUTS (CLKP, CLKN)

Single-Ended Input High
Threshold

V

IH

CLKTYP = GND, CLKN = GND

V

Single-Ended Input Low
Threshold

V

IL

CLKTYP = GND, CLKN = GND

V

Differential Input Voltage Swing CLKTYP = high 1.4

V

P-P

Differential Input Common-Mode
Voltage

CLKTYP = high

V

DCE = OV

DD

20

Minimum Clock Duty Cycle

DCE = GND 45

%

DCE = OV

DD

80

Maximum Clock Duty Cycle

DCE = GND 65

%

Input Resistance R

CLK

Figure 4 5 kΩ

Input Capacitance C

CLK

2pF

DIGITAL INPUTS (CLKTYP, G/T, PD)

Input High Threshold V

IH

0.8 x
V

Input Low Threshold V

IL

0.2 x
V

VIH = OV

DD

±5

Input Leakage Current

V

IL

= 0 ±5

µA

Input Capacitance C

DIN

5pF

SYMBOL

MIN TYP MAX

1.65

0.512

-0.512

1.024

0.8 x
V

DD

VDD / 2

0.2 x
V

DD

OV

DD

OV

DD

MAX1207

65Msps, 12-Bit ADC

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN=

-0.5dBFS, CLKTYP = high, DCE = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DIGITAL OUTPUTS (D0–D11, DAV, DOR)

D0–D11, DOR, I

SINK

= 200µA 0.2

Output-Voltage Low V

OL

DAV, I

SINK

= 600µA 0.2

V

D0–D11, DOR, I

SOURCE

= 200µA

Output-Voltage High V

OH

DAV, I

SOURCE

= 600µA

V

Tri-State Leakage Current I

LEAK

(Note 4) ±5 µA

D11–D0, DOR Tri-State Output
Capacitance

C

OUT

(Note 4) 3 pF

DAV Tri-State Output
Capacitance

C

DAV

(Note 4) 6 pF

POWER REQUIREMENTS

Analog Supply Voltage V

DD

3.0 3.3 3.6 V

Digital Output Supply Voltage OV

DD

1.7 2.0

V

Normal operating mode,
f

IN

= 32.4MHz at -0.5dBFS,

CLKTYP = GND, single-ended clock

Normal operating mode,
f

IN

= 32.4MHz at -0.5dBFS,

CLKTYP = OV

DD

, differential clock

119

Analog Supply Current I

VDD

Power-down mode, clock idle,
PD = OV

DD

mA

Normal operating mode,
f

IN

= 32.4MHz at -0.5dBFS,

CLKTYP = GND, single-ended clock

316

Normal operating mode,
f

IN

= 32.4MHz at -0.5dBFS,

CLKTYP = OV

DD

, differential clock

342 393

Analog Power Dissipation P

DISS

Power-down mode, clock idle,
PD = OV

DD

mW

OV

DD

- 0.2

OV

DD

- 0.2

V

+ 0.3V

95.8

DD

103.8

0.045

0.15

MAX1207

65Msps, 12-Bit ADC

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN=

-0.5dBFS, CLKTYP = high, DCE = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Normal operating mode,
f

IN

= 32.4MHz at -0.5dBFS,

OV

DD

= 2.0V, CL ≈ 5pF

mA

Digital Output Supply Current I

OVDD

Power-down mode, clock idle,
PD = OV

DD

6µA

TIMING CHARACTERISTICS (Figure 5)

Clock Pulse-Width High t

CH

7.7 ns

Clock Pulse-Width Low t

CL

7.7 ns

Data Valid Delay t

DAV

CL = 5pF (Note 5) 6.4 ns

Data Setup Time Before Rising
Edge of DAV

t

SETUP

CL = 5pF (Notes 3, 5) 8.5 ns

Data Hold Time After Rising Edge
of DAV

t

HOLD

CL = 5pF (Notes 3, 5) 6.3 ns

Wake-Up Time from Power-Down

t

WAKE

V

REFIN

= 2.048V 10 ms

Note 1: Specifications ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization.
Note 2: Specifications guaranteed by design and characterization. Devices tested for performance during production test.
Note 3: Guaranteed by design and characterization.
Note 4: During power-down, D11–D0, DOR, and DAV are high impedance.
Note 5: Digital outputs settle to V

IH

or VIL.

10.9

MAX1207

65Msps, 12-Bit ADC

_______________________________________________________________________________________ 7

Typical Operating Characteristics

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN= -0.5dBFS

differential input, DCE = high, CLKTYP = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA = +25°C, unless otherwise noted.)

SINGLE-TONE FFT PLOT

(8192-POINT DATA RECORD)

MAX1207 toc01

FREQUENCY (MHz)

AMPLITUDE (dBFS)

282416 208124

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110
032

f

CLK

= 65.0036Msps

f

IN

= 10.006MHz

A

IN

= -0.47dBFS
SNR = 68.55dBc
SINAD = 68.50dBc
THD = -87.6dBc
SFDR = 88.5dBc

HD2

HD3

SINGLE-TONE FFT PLOT

(8192-POINT DATA RECORD)

MAX1207 toc02

FREQUENCY (MHz)

AMPLITUDE (dBFS)

282416 208124

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110
032

f

CLK

= 65.0036Msps

f

IN

= 32.367MHz

A

IN

= -0.47dBFS
SNR = 68.55dBc
SINAD = 68.50dBc
THD = -87.2dBc
SFDR = 89.0dBc

HD2

HD3

SINGLE-TONE FFT PLOT

(8192-POINT DATA RECORD)

MAX1207 toc03

FREQUENCY (MHz)

AMPLITUDE (dBFS)

282416 208124

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110
032

f

CLK

= 65.0036Msps

f

IN

= 69.995MHz

A

IN

= -0.526dBFS
SNR = 68.29dBc
SINAD = 68.23dBc
THD = -86.7dBc
SFDR = 89.0dBc

HD2

HD3

HD4

HD6

TWO-TONE FFT PLOT

(16,384-POINT DATA RECORD)

MAX1207 toc04

FREQUENCY (MHz)

AMPLITUDE (dBFS)

282416 208124

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110
032

f

CLK

= 65.0036Msps

f

IN1

= 44.0036MHz

A

IN1

= -7.0dBFS

f

IN2

= 46.0032MHz

A

IN2

= -7.0dBFS
SNR = 64.72dBc
SINAD = 64.69dBc
SFDR

TT

= 87.87dBc
IMD = -86.09dB
IM3 = -89.40dBc

f

IN1

f

IN2

f

IN1 + fIN2

f

IN1

+ 2 x f

IN2

TWO-TONE FFT PLOT

(16,384-POINT DATA RECORD)

MAX1207 toc05

FREQUENCY (MHz)

AMPLITUDE (dBFS)

282416 208124

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110
032

f

CLK

= 65.0036Msps

f

IN1

= 68.9989MHz

A

IN1

= -7.0dBFS

f

IN2

= 70.9985MHz

A

IN2

= -7.0dBFS
SNR = 64.34dBc
SINAD = 64.33dBc
SFDR

TT

= 89.17dBc
IMD = -84.38dB
IM3 = -90.16dBc

2 x f

IN2

+ f

IN1

3 x f

IN2

+ f

IN1

2 x f

IN2

+ f

IN

3 x f

IN2

+ 2 x f

IN1

f

IN1

f

IN2

INTEGRAL NONLINEARITY

MAX1207 toc06

DIGITAL OUTPUT CODE

INL (LSB)

358430722048 25601024 1536512

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1.0

-1.0
0 4096

DIFFERENTIAL NONLINEARITY

MAX1207 toc07

DIGITAL OUTPUT CODE

DNL (LSB)

358430722048 25601024 1536512

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

-0.5
04096

MAX1207

65Msps, 12-Bit ADC

8 _______________________________________________________________________________________

SIGNAL-TO-NOISE RATIO

vs. SAMPLING RATE

MAX1207 toc08

f

CLK

(MHz)

SNR (dB)

605545 5020 25 30 35 4015

61

62

63

64

65

66

67

68

69

70

60

10 65

fIN = 32.3MHz

SIGNAL-TO-NOISE + DISTORTION

vs. SAMPLING RATE

MAX1207 toc09

f

CLK

(MHz)

SINAD (dB)

605545 5020 25 30 35 4015

61

62

63

64

65

66

67

68

69

70

60

10 65

fIN = 32.3MHz

TOTAL HARMONIC DISTORTION

vs. SAMPLING RATE

MAX1207 toc10

f

CLK

(MHz)

THD (dBc)

605545 5020 25 30 35 4015

-95

-90

-85

-80

-75

-70

-65

-60

-100
10 65

fIN = 32.3MHz

SPURIOUS-FREE DYNAMIC RANGE

vs. SAMPLING RATE

MAX1207 toc11

f

CLK

(MHz)

SFDR (dBc)

605545 5020 25 30 35 4015

65

70

75

80

85

90

95

100

60

10 65

fIN = 32.3MHz

Typical Operating Characteristics (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN= -0.5dBFS

differential input, DCE = high, CLKTYP = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA = +25°C, unless otherwise noted.)

MAX1207

65Msps, 12-Bit ADC

_______________________________________________________________________________________ 9

Typical Operating Characteristics (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), C

REFOUT

= 0.1µF, CL≈ 5pF at digital outputs, VIN= -0.5dBFS

differential input, DCE = high, CLKTYP = high, PD = low, G/T = low, f

CLK

= 65MHz (50% duty cycle), C

REFP

= C

REFN

= 0.1µF to GND, 1µF

in parallel with 10µF between REFP and REFN, C

COM

= 0.1µF in parallel with 2.2µF to GND, TA = +25°C, unless otherwise noted.)

SIGNAL-TO-NOISE RATIO

vs. SAMPLING RATE

MAX1207 toc12

f

CLK

(MHz)

SNR (dB)

605545 5020 25 30 35 4015

61

62

63

64

65

66

67

68

69

70

60

10 65

fIN = 70.1MHz

SIGNAL-TO-NOISE + DISTORTION

vs. SAMPLING RATE

MAX1207 toc13

f

CLK

(MHz)

SINAD (dB)

605545 5020 25 30 35 4015

61

62

63

64

65

66

67

68

69

70

60

10 65

fIN = 70.1MHz

TOTAL HARMONIC DISTORTION

vs. SAMPLING RATE

MAX1207 toc14

f

CLK

(MHz)

THD (dBc)

605545 5020 25 30 35 4015

-95

-90

-85

-80

-75

-70

-65

-60

-100
10 65

fIN = 70.1MHz

SPURIOUS-FREE DYNAMIC RANGE

vs. SAMPLING RATE

MAX1207 toc15

f

CLK

(MHz)

SFDR (dBc)

605545 5020 25 30 35 4015

65

70

75

80

85

90

95

100

60

10 65

fIN = 70.1MHz