Maxim Integrated MAX12527 User Manual

General Description

The MAX12527 is a dual 3.3V, 12-bit analog-to-digital
converter (ADC) featuring fully differential wideband
track-and-hold (T/H) inputs, driving internal quantizers.
The MAX12527 is optimized for low power, small size,
and high dynamic performance in intermediate frequen­cy (IF) and baseband sampling applications. This dual
ADC operates from a single 3.3V supply, consuming
only 620mW while delivering a typical 69.8dB signal-to­noise ratio (SNR) performance at a 175MHz input fre­quency. The T/H input stages accept single-ended or
differential inputs up to 400MHz. In addition to low oper­ating power, the MAX12527 features a 166µW power­down mode to conserve power during idle periods.

A flexible reference structure allows the MAX12527 to
use the internal 2.048V bandgap reference or accept
an externally applied reference and allows the refer­ence to be shared between the two ADCs. The refer­ence structure allows the full-scale analog input range
to be adjusted from ±0.35V to ±1.15V. The MAX12527
provides a common-mode reference to simplify design
and reduce external component count in differential
analog input circuits.

The MAX12527 supports either a single-ended or differ­ential input clock. User-selectable divide-by-two (DIV2)
and divide-by-four (DIV4) modes allow for design flexibil­ity and help eliminate the negative effects of clock jitter.
Wide variations in the clock duty cycle are compensated
with the ADC’s internal duty-cycle equalizer (DCE).

The MAX12527 features two parallel, 12-bit-wide,
CMOS-compatible outputs. The digital output format is
pin-selectable to be either two’s complement or Gray
code. A separate power-supply input for the digital out­puts accepts a 1.7V to 3.6V voltage for flexible interfac­ing with various logic levels. The MAX12527 is available
in a 10mm x 10mm x 0.8mm, 68-pin thin QFN package
with exposed paddle (EP), and is specified for the
extended (-40°C to +85°C) temperature range.

For a 14-bit, pin-compatible version of this ADC, refer to
the MAX12557 data sheet.

Applications

IF and Baseband Communication Receivers

Cellular, LMDS, Point-to-Point Microwave,

MMDS, HFC, WLAN
I/Q Receivers
Ultrasound and Medical Imaging
Portable Instrumentation
Digital Set-Top Boxes
Low-Power Data Acquisition

Features

♦ Direct IF Sampling Up to 400MHz
♦ Excellent Dynamic Performance

70.4dB/69.8dB SNR at f

IN

= 70MHz/175MHz

84.4dBc/80.2dBc SFDR at fIN= 70MHz/175MHz

♦ 3.3V Low Power Operation

647mW (Differential Clock Mode)
620mW (Single-Ended Clock Mode)

♦ Fully Differential or Single-Ended Analog Input
♦ Adjustable Differential Analog Input Voltage
♦ 750MHz Input Bandwidth
♦ Adjustable, Internal or External, Shared Reference
♦ Differential or Single-Ended Clock
♦ Accepts 25% to 75% Clock Duty Cycle
♦ User-Selectable DIV2 and DIV4 Clock Modes
♦ Power-Down Mode
♦ CMOS Outputs in Two’s Complement or Gray

Code

♦ Out-of-Range and Data-Valid Indicators
♦ Small, 68-Pin Thin QFN Package
♦ 14-Bit Compatible Version Available (MAX12557)
♦ Evaluation Kit Available (Order MAX12527 EV Kit)

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3543; Rev 0; 2/05

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

TEMP RANGE

PIN-PACKAGE

MAX12527ETK

68 Thin QFN-EP*

(10mm x 10mm x 0.8mm)

Pin Configuration appears at end of data sheet.

*EP = Exposed paddle.

PART

SAMPLING RATE

(Msps)

RESOLUTION

(Bits)

MAX12557 65 14
MAX12527 65 12

Selector Guide

-40°C to +85°C

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL≈ 10pF at digital outputs, VIN= -0.5dBFS (differen­tial), DIFFCLK/

SECLK = OVDD, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f

CLK

= 65MHz, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

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

INAP, INAN to GND ...-0.3V to the lower of (V

DD

+ 0.3V) and +3.6V

INBP, INBN to GND ...-0.3V to the lower of (V

DD

+ 0.3V) and +3.6V

CLKP, CLKN to

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

DD

+ 0.3V) and +3.6V

REFIN, REFOUT

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

DD

+ 0.3V) and +3.6V

REFAP, REFAN,

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

DD

+ 0.3V) and +3.6V

REFBP, REFBN,

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

DD

+ 0.3V) and +3.6V

DIFFCLK/SECLK, G/T, PD, SHREF, DIV2,

DIV4 to GND .........-0.3V to the lower of (VDD+ 0.3V) and +3.6V

D0A–D11A, D0B–D11B, DAV,

DORA, DORB to GND..............................-0.3V to (OV

DD

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)
68-Pin Thin QFN 10mm x 10mm x 0.8mm

(derate 70mW/°C above +70°C) ....................................4000mW

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

PARAMETER

CONDITIONS

UNITS

DC ACCURACY

Resolution 12 Bits
Integral Nonlinearity INL fIN = 3MHz

LSB

Differential Nonlinearity DNL fIN = 3MHz, no missing codes

LSB

Offset Error

%FSR

Gain Error

(Note 2)

%FSR

ANALOG INPUT (INAP, INAN, INBP, INBN)

Differential Input Voltage Range V

DIFF

Differential or single-ended inputs

V

Common-Mode Input Voltage

V

Analog Input Resistance R

IN

Each input (Figure 3) 3.4 kΩ

C

PAR

Fixed capacitance to ground,
each input (Figure 3)

2

Analog Input Capacitance

Switched capacitance,
each input (Figure 3)

4.5

pF

CONVERSION RATE

Maximum Clock Frequency f

CLK

65 MHz

Minimum Clock Frequency 5 MHz
Data Latency Figure 5 8

Clock

Cycles

DYNAMIC CHARACTERISTICS (differential inputs)
Small-Signal Noise Floor SSNF Input at -35dBFS (Note 2)

dBFS

fIN = 3MHz at -0.5dBFS
fIN = 32.5MHz at -0.5dBFS
fIN = 70MHz at -0.5dBFS

Signal-to-Noise Ratio SNR

f

IN

= 175MHz at -0.5dBFS

dB

SYMBOL

MIN TYP MAX

±0.3 ±1.1
±0.3 ±0.65
±0.1 ±0.7
±0.5 ±5.7
±0.5 ±3.4

±1.024
V

/ 2

DD

C

SAMPLE

67.0 71.1

68.2 70.8

67.2 69.8

70.6

70.4

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL≈ 10pF at digital outputs, VIN= -0.5dBFS (differen­tial), DIFFCLK/SECLK = OV

DD

, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f

CLK

= 65MHz, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

fIN = 3MHz at -0.5dBFS
fIN = 32.5MHz at -0.5dBFS
fIN = 70MHz at -0.5dBFS

Signal-to-Noise Plus Distortion SINAD

f

IN

= 175MHz at -0.5dBFS

dB

fIN = 3MHz at -0.5dBFS (Note 2)

91
fIN = 32.5MHz at -0.5dBFS
fIN = 70MHz at -0.5dBFS

Spurious-Free Dynamic Range SFDR

f

IN

= 175MHz at -0.5dBFS

dBc

fIN = 3MHz at -0.5dBFS (Note 2)
fIN = 32.5MHz at -0.5dBFS
fIN = 70MHz at -0.5dBFS

Total Harmonic Distortion THD

f

IN

= 175MHz at -0.5dBFS

dBc

fIN = 3MHz at -0.5dBFS -98
fIN = 32.5MHz at -0.5dBFS
fIN = 70MHz at -0.5dBFS

Second Harmonic HD2

f

IN

= 175MHz at -0.5dBFS

dBc

fIN = 3MHz at -0.5dBFS -97
fIN = 32.5MHz at -0.5dBFS
fIN = 70MHz at -0.5dBFS

Third Harmonic HD3

f

IN

= 175MHz at -0.5dBFS

dBc

f

IN1

= 68.5MHz at -7dBFS

f

IN2

= 71.5MHz at -7dBFS

-89

Two-Tone Intermodulation
Distortion (Note 3)

TTIMD

f

IN1

= 172.5MHz at -7dBFS

f

IN2

= 177.5MHz at -7dBFS

dBc

f

IN1

= 68.5MHz at -7dBFS

f

IN2

= 71.5MHz at -7dBFS

3rd-Order Intermodulation
Distortion

IM3

f

IN1

= 172.5MHz at -7dBFS

f

IN2

= 177.5MHz at -7dBFS

dBc

f

IN1

= 68.5MHz at -7dBFS

f

IN2

= 71.5MHz at -7dBFS

Two-Tone Spurious-Free
Dynamic Range

f

IN1

= 172.5MHz at -7dBFS

f

IN2

= 177.5MHz at -7dBFS

dBc

Full-Power Bandwidth FPBW Input at -0.2dBFS, -3dB rolloff

MHz

Aperture Delay t

AD

Figure 5 1.2 ns

Aperture Jitter t

AJ

Output Noise n

OUT

INAP = INAN = COMA
INBP = INBN = COMB

0.3

SYMBOL

SFDR

TT

MIN TYP MAX UNITS

68.1 70.7

70.4

70.2

65.9 69.3

81.9

86.3

84.4

71.1 80.2

-92.6 -82.9

-84.3

-83.7

-78.9 -69.8

-91.7

-94.5

-80.2

-86.3

-84.4

-85.6

-82.2

-92.2

-88.9

90.6

82.9
750

<0.15 ps

LSB

RMS

RMS

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL≈ 10pF at digital outputs, VIN= -0.5dBFS (differen­tial), DIFFCLK/SECLK = OV

DD

, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f

CLK

= 65MHz, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

Overdrive Recovery Time ±10% beyond full-scale 1

Clock

cycle

INTERCHANNEL CHARACTERISTICS

f

INA

or f

INB

= 70MHz at -0.5dBFS 90

Crosstalk Rejection

f

INA

or f

INB

= 175MHz at -0.5dBFS 85

dB

Gain Matching

dB

Offset Matching

%FSR

INTERNAL REFERENCE (REFOUT)
REFOUT Output Voltage

V

REFOUT Load Regulation -1mA < I

REFOUT

< +1mA 35

mV/mA

REFOUT Temperature Coefficient

TC

REF

ppm/°C

Short to VDD—sinking

REFOUT Short-Circuit Current

Short to GND—sourcing 2.1

mA

BUFFERED REFERENCE MODE (REFIN is driven by REFOUT or an external 2.048V single-ended reference source;

V

REFAP

/V

REFAN/VCOMA

and V

REFBP

/V

REFBN/VCOMB

are generated internally)

REFIN Input Voltage V

REFIN

V

REFIN Input Resistance R

REFIN

MΩ

COM_ Output Voltage

V

COMA

V

COMB

VDD / 2

V

REF_P Output Voltage

V

REFAP

VDD / 2 + (V

REFIN

x 3/8)

V

REF_N Output Voltage

V

REFAN

VDD / 2 - (V

REFIN

x 3/8)

V

Differential Reference Voltage

V

REFA

V

REFB

V

REFA

= V

REFAP

- V

REFAN

V

REFB

= V

REFBP

- V

REFBN

V

Differential Reference
Temperature Coefficient

TC

REF

ppm/°C

UNBUFFERED EXTERNAL REFERENCE (REFIN = GND, V

REFAP/VREFAN/VCOMA

and V

REFBP/VREFBN/VCOMB

are applied

externally, V

COMA

= V

COMB

= VDD / 2)

REF_P Input Voltage

V

REFAP

V

REF_P

- V

COM

V

REF_N Input Voltage

V

REFAN

V

REF_N

- V

COM

V

COM_ Input Voltage V

COM

VDD / 2

V

Differential Reference Voltage

V

REFA

V

REFB

V

REF_

= V

REF_P

- V

REF_N

= V

REFIN

x 3/4

V

SYMBOL

MIN TYP MAX

±0.01 ±0.1
±0.01

V

REFOUT

2.000 2.048 2.080

V

REFBP

V

REFBN

V

REFBP

V

REFBN

1.60 1.65 1.70

1.440 1.536 1.590

+0.768

±50

0.24

2.048
>50

2.418

0.882

±25

-0.768

1.65

1.536

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL≈ 10pF at digital outputs, VIN= -0.5dBFS (differen­tial), DIFFCLK/SECLK = OV

DD

, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f

CLK

= 65MHz, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

REF_P Sink Current

I

REFAP

I

REFBP

V

REF_P

= 2.418V 1.2 mA

REF_N Source Current

I

REFAN

I

REFBN

V

REF_N

= 0.882V

mA

COM_ Sink Current

I

COMA

I

COMB

V

COM_

= 1.65V

mA

REF_P, REF_N Capacitance

C

REF_P

,

13 pF

COM_ Capacitance C

COM_

6pF

CLOCK INPUTS (CLKP, CLKN)

Single-Ended Input High
Threshold

V

IH

DIFFCLK/SECLK = GND, CLKN = GND

0.8 x
V

Single-Ended Input Low
Threshold

V

IL

DIFFCLK/SECLK = GND, CLKN = GND

0.2 x
V

Minimum Differential Clock Input
Voltage Swing

DIFFCLK/SECLK = OV

DD

0.2 V

P-P

Differential Input Common-Mode
Voltage

DIFFCLK/SECLK = OV

DD

V

CLK_ Input Resistance R

CLK

Each input (Figure 4) 5 kΩ

CLK_ Input Capacitance C

CLK

Each input 2 pF

DIGITAL INPUTS (DIFFCLK/SECLK, G/T, PD, DIV2, DIV4)

Input High Threshold V

IH

0.8 x
V

Input Low Threshold V

IL

0.2 x
V

OVDD applied to input ±5

Input Leakage Current

Input connected to ground ±5

µA

Digital Input Capacitance C

DIN

5pF

DIGITAL OUTPUTS (D0A–D11A, D0B–D11B, DORA, DORB, DAV)

D0A–D11A, D0B–D11B, DORA, DORB:
I

SINK

= 200µA

0.2

Output-Voltage Low V

OL

DAV: I

SINK

= 600µA 0.2

V

D0A–D11A, D0B–D11B, DORA, DORB:
I

SOURCE

= 200µA

OV

DD

-

0.2

Output-Voltage High V

OH

DAV: I

SOURCE

= 600µA

OV

DD

-

0.2

V

OVDD applied to input ±5

Tri-State Leakage Current
(Note 4)

I

LEAK

Input connected to ground ±5

µA

SYMBOL

C

REF_N

MIN TYP MAX

0.85

0.85

V

DD

V

DD

V

/ 2

DD

OV

DD

OV

DD

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL≈ 10pF at digital outputs, VIN= -0.5dBFS (differen­tial), DIFFCLK/SECLK = OV

DD

, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f

CLK

= 65MHz, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

D 0A–D 11A, D O RA,
D 0B–D 11B and D ORB Tr i - S tate
O utp ut C ap aci tance ( N ote 4)

C

OUT

3pF

DAV Tri-State Output
Capacitance (Note 4)

C

DAV

6pF

POWER REQUIREMENTS

Analog Supply Voltage V

DD

V

Digital Output Supply Voltage OV

DD

2.0

V

Normal operating mode
f

IN

= 175MHz at -0.5dBFS,
single-ended clock
(DIFFCLK/SECLK = GND)

Normal operating mode
f

IN

= 175MHz at -0.5dBFS
differential clock
(DIFFCLK/SECLK = OV

DD

)

Analog Supply Current I

VDD

Power-down mode (PD = OVDD)
clock idle

mA

Normal operating mode
f

IN

= 175MHz at -0.5dBFS
single-ended clock
(DIFFCLK/SECLK = GND)

Normal operating mode
f

IN

= 175MHz at -0.5dBFS
differential clock
(DIFFCLK/SECLK = OV

DD

)

Analog Power Dissipation P

VDD

Power-down mode (PD = OVDD)
clock idle

mW

Normal operating mode
f

IN

= 175MHz at -0.5dBFS

Digital Output Supply Current I

OVDD

Power-down mode (PD = OVDD)
clock idle

mA

SYMBOL

MIN TYP MAX

3.15 3.30 3.60

1.70

188

196 215

V

DD

0.05

620

647 710

0.165

19.7

0.001

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

_______________________________________________________________________________________ 7

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL≈ 10pF at digital outputs, VIN= -0.5dBFS (differen­tial), DIFFCLK/SECLK = OV

DD

, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, f

CLK

= 65MHz, 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

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

5.4 ns

Data Setup Time Before Rising
Edge of DAV

t

SETUP

(Note 5) 7.0 ns

Data Hold Time After Rising Edge
of DAV

t

HOLD

(Note 5) 7.0 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 production test for ≥+25°C.
Note 3: Two-tone intermodulation distortion measured with respect to a single-carrier amplitude, and not the peak-to-average input

power of both input tones.

Note 4: During power-down, D0A–D11A, D0B–D11B, DORA, DORB, and DAV are high impedance.
Note 5: Guaranteed by design and characterization.

Typical Operating Characteristics

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference mode), CL≈ 5pF at digital outputs, VIN= -0.5dBFS,
DIFFCLK/SECLK = OV

DD

, PD = GND, G/T = GND, f

CLK

= 65MHz (50% duty cycle), TA= +25°C, unless otherwise noted.)

FFT PLOT (16,384-POINT DATA RECORD)

MAX12527 toc01

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dBFS)

30252015105

-100

-80

-60

-40

-20

0

-120
035

f

CLK

= 65MHz

f

IN

= 3.00125MHz

A

IN

= -0.53dBFS
SNR = 71dB
SINAD = 70.9dB
THD = -94dBc
SFDR = 93.6dBc

HD2

HD3

FFT PLOT (32,768-POINT DATA RECORD)

MAX12527 toc02

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dBFS)

302515 20105

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-120
0

f

CLK

= 65.00352MHz

f

IN

= 32.40059MHz

A

IN

= -0.506dBFS
SNR = 70.5dB
SINAD = 70.2dB
THD = -86.9dBc
SFDR = 88.7dBc

HD2

HD3

FFT PLOT (32,768-POINT DATA RECORD)

MAX12527 toc03

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dBFS)

302515 20105

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-120
0

f

CLK

= 65.00352MHz

f

IN

= 70.00852MHz

A

IN

= -0.506dBFS
SNR = 70.1dB
SINAD = 69.8dB
THD = -82.1dBc
SFDR = 82.4dBc

HD2

HD3

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

8 _______________________________________________________________________________________

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

MAX12527 toc07

DIGITAL OUTPUT CODE

INL (LSB)

360030001800 24001200600

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

-0.5
0 4200

f

CLK

= 65MHz

f

IN

= 3.00119MHz

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

MAX12527 toc08

DIGITAL OUTPUT CODE

DNL (LSB)

360030001800 24001200600

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

-0.5
0 4200

f

CLK

= 65MHz

f

IN

= 3.00119MHz

SNR, SINAD vs. ANALOG INPUT FREQUENCY

(f

CLK

= 65.00352MHz, AIN = -0.5dBFS)

MAX12527 toc09

fIN (MHz)

SNR, SINAD (dB)

350300200 250100 15050

52

54

56

58

60

62

64

66

68

70

72

50

0 400

SINAD

SNR

-THD, SFDR vs. ANALOG INPUT FREQUENCY
(f

CLK

= 65.00352MHz, AIN = -0.5dBFS)

MAX12527 toc10

fIN (MHz)

-THD, SFDR (dBc)

350300200 250100 15050

55

60

65

70

75

80

85

90

95

50

0 400

SFDR

-THD

SNR, SINAD vs. ANALOG INPUT AMPLITUDE

(f

CLK

= 65.00352MHz, fIN = 70MHz)

MAX12527 toc11

AIN (dBFS)

SNR, SINAD (dB)

-5-10-15-20-25-30-35-40-45-50

25

35

45

55

65

75

15

-55 0

SNR

SINAD

-THD, SFDR vs. ANALOG INPUT AMPLITUDE
(f

CLK

= 65.00352MHz, fIN = 70MHz)

MAX12527 toc12

AIN (dBFS)

-THD, SFDR (dBc)

-5-10-15-20-25-30-35-40-45-50

35

45

55

65

75

85

95

25

-55 0

SFDR

-THD

FFT PLOT (32,768-POINT DATA RECORD)

MAX12527 toc04

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dBFS)

302515 20105

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-120
0

f

CLK

= 65.00352MHz

f

IN

= 174.90525MHz

A

IN

= -0.448dBFS
SNR = 69.4dB
SINAD = 68.9dB
THD = -78.6dBc
SFDR = 81.1dBc

HD2

HD3

TWO-TONE IMD PLOT

(16,384-POINT DATA RECORD)

MAX12527 toc05

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dBFS)

30252015105

-100

-80

-60

-40

-20

0

-120
0

f

CLK

= 65.00352MHz

f

IN1

= 68.49889MHz

f

IN2

= 71.49832MHz

A

IN1

= -6.96dBFS

A

IN2

= -7.02dBFS
IM3 = -92.25dBc
IMD = -89.08dBc

f

IN1

f

IN2

2f

IN2

+ f

IN1

TWO-TONE IMD PLOT

(16,384-POINT DATA RECORD)

MAX12527 toc06

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dBFS)

30252015105

-100

-80

-60

-40

-20

0

-120
0

f

CLK

= 65.00352MHz

f

IN1

= 172.50293MHz

A

IN1

= -6.99dBFS

f

IN2

= 177.40198MHz

A

IN2

= -7.01dBFS
IM3 = -88.88dBc
IMD = -82.24dBc

f

IN1

f

IN2

f

IN1

+ f

IN2

f

IN2

- f

IN1

Typical Operating Characteristics (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference mode), CL≈ 5pF at digital outputs, VIN= -0.5dBFS,
DIFFCLK/SECLK = OV

DD

, PD = GND, G/T = GND, f

CLK

= 65MHz (50% duty cycle), TA= +25°C, unless otherwise noted.)

MAX12527

Dual, 65Msps, 12-Bit, IF/Baseband ADC

_______________________________________________________________________________________ 9

SNR, SINAD vs. ANALOG INPUT AMPLITUDE

(f

CLK

= 65.00352MHz, fIN = 175MHz)

MAX12527 toc13

AIN (dBFS)

SNR, SINAD (dB)

-5-10-15-20-25-30-35-40-45-50

25

35

45

55

65

75

15

-55 0

SNR

SINAD

-THD, SFDR vs. ANALOG INPUT AMPLITUDE
(f

CLK

= 65.00352MHz, fIN = 175MHz)

MAX12527 toc14

AIN (dBFS)

-THD, SFDR (dBc)

-5-10-15-20-25-30-35-40-45-50

35

45

55

65

75

85

95

25

-55 0

SFDR

-THD

SNR, SINAD vs. CLOCK SPEED
(f

IN

= 70MHz, AIN = -0.5dBFS)

MAX12527 toc15

f

CLK

(MHz)

SNR, SINAD (dB)

6055504540353025

62

64

66

68

70

72

60

20 65

SNR

SINAD

-THD, SFDR vs. CLOCK SPEED
(f

IN

= 70MHz, AIN = -0.5dBFS)

MAX12527 toc16

f

CLK

(MHz)

-THD, SFDR (dBc)

6055504540353025

65

70

75

80

85

90

60

20 65

SFDR

-THD

SNR, SINAD vs. CLOCK SPEED

(f

IN

= 175MHz, AIN = -0.5dBFS)

MAX12527 toc17

f

CLK

(MHz)

SNR, SINAD (dB)

6055504540353025

62

64

66

68

70

72

60

20 65

SNR

SINAD

-THD, SFDR vs. CLOCK SPEED

(f

IN

= 175MHz, AIN = -0.5dBFS)

MAX12527 toc18

f

CLK

(MHz)

-THD, SFDR (dBc)

6055504540353025

65

70

75

80

85

90

60

20 65

SFDR

-THD

SNR, SINAD vs. ANALOG SUPPLY VOLTAGE

(f

CLK

= 65.00352MHz, fIN = 70MHz)

MAX12527 toc19

VDD (V)

SNR, SINAD (dB)

3.53.43.33.23.1

62

64

66

68

70

72

60

3.0 3.6

SINAD

SNR

-THD, SFDR vs. ANALOG SUPPLY VOLTAGE
(f

CLK

= 65.00352MHz, fIN = 70MHz)

MAX12527 toc20

VDD (V)

-THD, SFDR (dBc)

3.53.43.33.23.1

65

70

75

80

85

90

60

3.0 3.6

-THD

SFDR

SNR, SINAD vs. ANALOG SUPPLY VOLTAGE

(f

CLK

= 65.00352MHz, fIN = 175MHz)

MAX12527 toc21

VDD (V)

SNR, SINAD (dB)

3.53.43.33.23.1

62

64

66

68

70

72

60

3.0 3.6

SINAD

SNR

Typical Operating Characteristics (continued)

(VDD= 3.3V, OVDD= 2.0V, GND = 0, REFIN = REFOUT (internal reference mode), CL≈ 5pF at digital outputs, VIN= -0.5dBFS,
DIFFCLK/SECLK = OV

DD

, PD = GND, G/T = GND, f

CLK

= 65MHz (50% duty cycle), TA= +25°C, unless otherwise noted.)