AD9957_07 datasheet(4/60 Pages) AD

Teilenummer	AD9957

Bauteilbeschribung	1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC

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Hersteller	AD [Analog Devices]

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AD9957

Rev. 0 | Page 4 of 60

SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

AVDD (1.8V) and DVDD (1.8V) = 1.8 V ± 5%, AVDD (3.3V) = 3.3 V ± 5%, DVDD_I/O = 3.3 V ± 5%, T = 25°C, RSET = 10 kΩ,

IOUT = 20 mA, external reference clock frequency = 1000 MHz with REFCLK multiplier disabled, unless otherwise noted.

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

REF_CLK INPUT CHARACTERISTICS

Frequency Range

REFCLK Multiplier

Disabled

25

10001

MHz

Enabled

3.2

60

MHz

Maximum REFCLK Input Divider Frequency

Full temperature range

1500

1900

MHz

Minimum REFCLK Input Divider Frequency

Full temperature range

25

35

MHz

External Crystal

25

MHz

Input Capacitance

3

pF

Input Impedance (Differential)

2.8

kΩ

Input Impedance (Single-Ended)

1.4

kΩ

Duty Cycle

REFCLK multiplier disabled

45

55

%

REFCLK multiplier enabled

40

60

%

REF_CLK Input Level

Single-ended

50

1000

mV p-p

Differential

100

2000

mV p-p

REFCLK MULTIPLIER VCO GAIN CHARACTERISTICS

VCO Gain (KV) @ Center Frequency

VCO0 range setting

429

MHz/V

VCO1 range setting

500

MHz/V

VCO2 range setting

555

MHz/V

VCO3 range setting

750

MHz/V

VCO4 range setting

789

MHz/V

VCO5 range setting2

850

MHz/V

REFCLK_OUT CHARACTERISTICS

Maximum Capacitive Load

20

pF

Maximum Frequency

25

MHz

DAC OUTPUT CHARACTERISTICS

Full-Scale Output Current

8.6

20

31.6

mA

Gain Error

−10

+10

%FS

Output Offset

2.3

μA

Differential Nonlinearity

0.8

LSB

Integral Nonlinearity

1.5

LSB

Output Capacitance

5

pF

Residual Phase Noise

@ 1 kHz Offset, 20 MHz AOUT

REFCLK Multiplier

Disabled

−152

dBc/Hz

Enabled @ 20×

−140

dBc/Hz

Enabled @ 100×

−140

dBc/Hz

AC Voltage Compliance Range

−0.5

+0.5

V

SPURIOUS-FREE DYNAMIC RANGE (SFDR SINGLE TONE)

fOUT = 20.1 MHz

−70

dBc

fOUT = 98.6 MHz

−69

dBc

fOUT = 201.1 MHz

−61

dBc

fOUT = 397.8 MHz

−54

dBc

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