LTC2234IUK#TRPBF【PDF 7/24 页】IC ADC 10BIT 135MSPS SAMPL 48QFN

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LTC2234

2234fa

APPLICATIO S I FOR ATIO

signal at its optimum DC level. Terminating on the trans-

former secondary is desirable, as this provides a common

mode path for charging glitches caused by the sample and

hold. Figure 3 shows a 1:1 turns ratio transformer. Other

turns ratios can be used if the source impedance seen by

the ADC does not exceed 100

for each ADC input. A

disadvantage of using a transformer is the loss of low

frequency response. Most small RF transformers have

poor performance at frequencies below 1MHz.

Figure 4 demonstrates the use of a differential amplifier to

convert a single ended input signal into a differential input

signal. The advantage of this method is that it provides low

frequency input response; however, the limited gain band-

width of most op amps will limit the SFDR at high input

frequencies.

Figure 5 shows a single-ended input circuit. The imped-

ance seen by the analog inputs should be matched. This

circuit is not recommended if low distortion is required.

The 25

resistorsand12pFcapacitorontheanaloginputs

serve two purposes: isolating the drive circuitry from the

sample-and-hold charging glitches and limiting the

wideband noise at the converter input. For input frequen-

cies higher than 100MHz, the capacitor may need to be

decreased to prevent excessive signal loss.

For input frequencies above 100MHz the input circuits of

Figure 6, 7 and 8 are recommended. The balun trans-

former gives better high frequency response than a flux

coupled center tapped transformer. The coupling capaci-

tors allow the analog inputs to be DC biased at 1.6V. In

Figure 8 the series inductors are impedance matching

elements that maximize the ADC bandwidth.

Reference Operation

Figure 9 shows the LTC2234 reference circuitry consisting

of a 1.6V bandgap reference, a difference amplifier and

switching and control circuit. The internal voltage refer-

ence can be configured for two pin selectable input ranges

of 2V (

±1Vdifferential)or1V(±0.5Vdifferential).Tyingthe

SENSE pin to VDD selects the 2V range; tying the SENSE

pin to VCM selects the 1V range.

The 1.6V bandgap reference serves two functions: its

output provides a DC bias point for setting the common

mode voltage of any external input circuitry; additionally,

the reference is used with a difference amplifier to gener-

ate the differential reference levels needed by the internal

ADC circuitry. An external bypass capacitor is required for

the 1.6V reference output, VCM. This provides a high

frequency low impedance path to ground for internal and

external circuitry.

Figure 4. Differential Drive with an Amplifier

Figure 5. Single-Ended Drive

AIN

–

12pF

2.2

3pF

VCM

LTC2234

2234 F04

–

ANALOG

INPUT

HIGH SPEED

DIFFERENTIAL

AMPLIFIER

AMPLIFIER = LTC6600-20,

"LT1993", ETC.

0.1

ANALOG

INPUT

VCM

AIN

–

12pF

2234 F05

2.2

0.1

LTC2234

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