RTH010 データシートの表示（PDF） - Unspecified

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RTH010

9GHz Bandwidth 1GS/s Dual Track-and-Hold

Unspecified 

RTH010 DATA SHEET REV F

TH2 and the output is only 10-bit accurate

during the latter part of half a clock cycle.

Lower limits for the sampling rates of TH1 and

TH2 are set by single-ended hold-mode droop

rates, and lead to the specification of maximum

hold times (thold1,max and thold2,max). For

longer hold times, the DTH must be allowed

sufficient recovery time during track phase (or a

sequence of track phases), so it can return to

normal operation mode. The bandwidth of

subsequent circuitry can be minimal if TH2 is

clocked at its lowest recommended frequency,

100 MHz. Since TH1 should be clocked at least

at 200 MHz, and possibly faster to meet jitter

Signal Descriptions

The RTH010 inputs are terminated on-chip with

50 Ω to GND. This automatically protects

against off-chip high-impedance high-voltage

disturbances. The absolute maximum rated

voltage at input termination resistors is ±1 V, at

20 mA current. The RTH010 is designed for 1-

Vpp differential input signals, and can accept

common-mode offsets up to ±100 mV. If

operated in single-ended mode, terminate the

complementary input off-chip with 50 Ω to the

same common mode as the driven input. The

single-ended FSR is half that of the differential

FSR. Distortion in the single-ended mode can be

up to 6 dB higher than in differential mode, and

differential input should be used for optimal

performance. The INP and INN inputs are

equivalent, except for the polarity of their effect

on OUTP and OUTN.

All four clock input signals are terminated on-

chip with 50 Ω to GND. For lowest clock source

jitter, use a sinusoidal clock source. Use

differential clock signals for optimal

performance. Large CLK1(B) amplitude benefits

aperture jitter performance, small CLK1(B) and

CLK2(B) amplitudes minimizes distortion due to

clock feed-through in the higher clock frequency

range (500 to 1000 MHz). Independent of the

clock waveform, clock slew rates < 2 V/ns are

recommended to minimize clock feed-through

requirements, CLK1(B) and CLK2(B) can be

chosen different, as long as they are locked to

each other with a proper phase relationship.

Minimum required single-pole bandwidth at the

output for 10-bit precision is (10ln2/2π) x fCLK2, or

approximately 1.1fCLK2. In practice, <200 MHz

bandwidth of subsequent circuitry would be

sufficient, if fCLK2 is 100 MHz.

One digital input, Track Mode Select (TMS), is

provided to put both TH’s in track mode,

independent of the clock signals. The bandwidth

of the DTH is substantially lower in this mode

than in the sampled mode. The TMS is useful for

low sample-rate operation, including DC testing

related distortion. In case of single-ended

clocking the complementary input(s) can be

terminated directly to GND (lowest noise, clock

waveform distortion is not critical). Distortion for

single-ended clocks can be several dB higher

than for differential clocks, and differential clocks

should be used for optimal performance.

The track-mode select, TMS, can simply be left

open for the (default) sampled-mode operation

of the RTH010. Grounding the TMS puts both

track-and-holds, TH1 and TH2, in track-mode. In

this state, the TMS draws up to 0.75 mA of

current.

Due to its highly differential design, the RTH010

requires relatively modest power supply

decoupling. The 0.01 µF capacitors VEE-to-

GND and VEE-to-VCC (Figure 4) should be

placed as close to the package as possible.

Larger low frequency power supply decoupling

capacitors, VEE-to-GND and VCC-to-GND,

should be placed within 1 inch of the RTH010.

Depending on the expected noise on the

supplies more capacitors in parallel may need to

be used. With low-impedance supplies that are

very quiet (no digital circuitry), the RTH010 can

also perform well with no external decoupling at

all.

The product specifications contained in this data sheet are subject to change. Rockwell Scientific Company reserves the right to make changes to its product

specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use.

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