THS1041

SLAS289C − OCTOBER 2001 − REVISED OCTOBER 2004

6

www.ti.com

electrical characteristics

over recommended operating conditions, AVDD = 3 V, DVDD = 3 V, fs = 40 MSPS/50% duty cycle, MODE = AVDD (internal reference),

differential input range = 1 Vpp and 2 Vpp, PGA = 1X, TA = Tmin to Tmax (unless otherwise noted) (continued)

dynamic performance (ADC and PGA)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ENOB

Effective number of bits

f = 4.8 MHz, −0.5 dBFS

8.8

9.6

Bits

ENOB

Effective number of bits

f = 20 MHz, −0.5 dBFS

9.5

Bits

SFDR

Spurious free dynamic range

f = 4.8 MHz, −0.5 dBFS

60.5

72

dB

SFDR

Spurious free dynamic range

f = 20 MHz, −0.5 dBFS

70

dB

THD

Total harmonic distortion

f = 4.8 MHz, −0.5 dBFS

− 72.5

− 61.3

dB

THD

Total harmonic distortion

f = 20 MHz, −0.5 dBFS

− 71.6

dB

SNR

Signal-to-noise ratio

f = 4.8 MHz, −0.5 dBFS

55.7

60

dB

SNR

Signal-to-noise ratio

f = 20 MHz, −0.5 dBFS

57

dB

SINAD

Signal-to-noise and distortion

f = 4.8 MHz, −0.5 dBFS

55.6

59.7

dB

SINAD

Signal-to-noise and distortion

f = 20 MHz, −0.5 dBFS

59.6

dB

BW

Full power bandwidth (−3 dB)

900

MHz

PGA (See Note 7)

PARAMETER

MIN

TYP

MAX

UNIT

Gain range (linear scale)

0.5

4

V/V

Gain step size (linear scale)

0.485

0.5

0.515

V/V

Gain error (deviation from ideal, all gain settings)

−3%

3%

Number of control bits

3

Bits

clamp amplifier and clamp DAC (See Note 8)

PARAMETER

MIN

TYP

MAX

UNIT

Resolution

10

Bits

DAC output range

REFB

REFT

V

DAC differential nonlinearity

−1

1

LSB

DAC integral nonlinearity

−3

3

LSB

Clamping analog output voltage range

0.1

AVDD−0.1

V

Clamping analog output voltage error

−40

40

mV

Clamping analog output bias voltage

MODE = AVDD AVDD/2 − 0.1

AVDD/2 + 0.1

mV

NOTES:

7. Gain settings increment by the gain step size for eight binary settings of 000 to 111 to correspond to the ideal gain range.

8. The CLAMPOUT pin must see a load capacitance of at least 10 nF to ensure stability of the on-chip clamp buffer. When using the

clamp for dc restoration, the signal coupling capacitor should be at least 10 nF. When using the clamp buffer as a dc biasing reference,

CLAMPOUT should be decoupled to analog ground through at least a 10-nF capacitor.