AFE5805 datasheet(4/53 Pages) TI2

4 / 53 page

AFE5805

SBOS421D – MARCH 2008 – REVISED MARCH 2010

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ELECTRICAL CHARACTERISTICS (continued)

AVDD_5V = 5.0V, AVDD1 = AVDD2 = DVDD = 3.3V, LVDD = 1.8V, single-ended input into LNA, ac-coupled (1.0mF),

VCNTL = 1.0V, fIN = 5MHz, Clock = 40MSPS, 50% duty cycle, internal reference mode, ISET = 56kΩ, LVDS buffer

setting = 3.5mA, at ambient temperature TA = +25°C, unless otherwise noted.

AFE5805

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DYNAMIC PERFORMANCE (continued)

Second-harmonic distortion

HD2

fIN = 2MHz; –1dBFS, PGA = 30dB

–70

dBFS

fIN = 5MHz; –1dBFS, PGA = 30dB

–54

–65

dBFS

fIN = 5MHz; –6dBFS, PGA = 20dB

–61

–69

dBFS

Third-harmonic distortion

HD3

fIN = 2MHz; –1dBFS, PGA = 30dB

–58

dBFS

fIN = 5MHz; –1dBFS, PGA = 30dB

–51

–59

dBFS

fIN = 5MHz; –6dBFS, PGA = 20dB

–56

–78

dBFS

f1 = 4.99MHz at –6dBFS,

Intermodulation distortion

IMD3

58.5

dBc

f2 = 5.01MHz at –32dBFS

Crosstalk

fIN = 5MHz, –1dBFS, PGA = 30dB

–67

dBc

CW—SIGNAL CHANNELS

Input voltage noise (CW)

RS = 0Ω, f = 1MHz

1.1

nV/

√Hz

Output noise correlation factor

Summing of eight channels

0.6

Output transconductance

At VIN = 100mVPP

15.6

mA/V

(IOUT/VIN)

Dynamic CW output current,

IOUTAC

2.9

mAPP

maximum

Static CW output current (sink)

IOUTDC

0.9

Output common-mode

VCM

2.5

voltage(4)

Output impedance

Ω

Output capacitance

INTERNAL REFERENCE VOLTAGES (ADC)

Reference top

VREFT

0.5

Reference bottom

VREFB

2.5

VREFT – VREFB

1.95

2.05

Common-mode voltage

VCM

1.425

1.5

1.575

(internal)

VCM output current

±2

EXTERNAL REFERENCE VOLTAGES (ADC)

Reference top

VREFT

2.4

2.5

2.6

Reference bottom

VREFB

0.4

0.5

0.6

VREFT – VREFB

1.9

2.1

Switching current(5)

2.5

(4)

CW outputs require an externally applied bias voltage of +2.5V.

(5)

Current drawn by the eight ADC channels from the external reference voltages; sourcing for VREFT, sinking for VREFB.

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