ADS4449 datasheet(4/54 Pages) TI

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ADS4449

SBAS603 – APRIL 2013

www.ti.com

SPECIAL PERFORMANCE MODES

Best performance can be achieved by writing certain modes depending upon source impedance, band of

operation and sampling speed. Table 1 summarizes the different these modes.

Table 1. High-Performance Modes Summary(1)

SPECIAL MODES SUMMARY

INPUT FREQUENCIES

SPECIAL MODE NAME

ADDRESS (Hex)

DATA (Hex)

(Up to 125 MHz)

(> 125 MHz)

High-frequency mode

Not required

Must

Optional

High SNR mode(2)

Optional

(1)

See the Serial Interface Registers section for details.

(2)

High SNR mode improves SNR typically by 1 dB at 170 MHz input frequency. See the Using High SNR Mode Register Settings section.

ELECTRICAL CHARACTERISTICS

Typical values are at TA = +25°C, full temperature range is TMIN = –40°C to TMAX = +85°C, ADC clock frequency = 250 MHz,

50% clock duty cycle, AVDD33V = 3.3 V, AVDD = 1.9 V, DRVDD = 1.8 V, and –1-dBFS differential input, unless otherwise

noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

RESOLUTION

Default resolution

Bits

ANALOG INPUTS

Differential input full-scale

VPP

VCM

Common mode input voltage

1.15

RIN

Input resistance, differential

At 170-MHz input frequency

700

CIN

Input capacitance, differential

At 170-MHz input frequency

3.3

With a 50-

Ω source driving the ADC

Analog input bandwidth, 3 dB

500

MHz

analog inputs

DYNAMIC ACCURACY

Offset error

Specified across devices and channels

–15

As a result of internal

reference inaccuracy

Specified across devices and channels

–5

%FS

Gain error(1)

alone

Of channel alone

Specified across channels within a device

±0.2

%FS

Channel gain error temperature coefficient(1)

0.001

Δ%/°C

POWER SUPPLY(2)

IAVDD33

3.3-V analog supply

IAVDD

Supply current

1.9-V analog supply

350

IDRVDD

1.8-V digital supply

355

PTOTAL

Total

1.47

1.6

PDISS(standby)

Power dissipation

Standby

400

PDISS(global)

Global power-down

(1)

There are two sources of gain error: internal reference inaccuracy and channel gain error.

(2)

A 185-MHz, full-scale, sine-wave input signal is applied to all four channels.

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