ADHV4702-1BCPZ-R7 datasheet(16/21 Pages) AD

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ADHV4702-1

Data Sheet

Rev. A | Page 16 of 21

–150

–100

–50

100

150

TIME (2µs/DIV)

TA = –40°C

TA = 0°C

TA = +25°C

TA = +85°C

Figure 45. Large Signal Pulse Response at Various TA with Two-Diode

Forward Voltages, Rising Edge, AV = 20, VS = ±110 V, VOUT = 200 V p-p,

RF = 100 kΩ, RLOAD = 10 kΩ, RADJ = 0 Ω

–150

–100

–50

100

150

TIME (2µs/DIV)

TA = –40°C

TA = 0°C

TA = +25°C

TA = +85°C

Figure 46. Large Signal Pulse Response at Various TA with Two-Diode

Forward Voltages, Falling Edge, AV = 20, VS = ±110 V, VOUT = 200 V p-p,

RF = 100 kΩ, RLOAD = 10 kΩ, RADJ = 0 Ω

–150

–100

–50

100

150

TIME (2µs/DIV)

TA = –40°C

TA = 0°C

TA = +25°C

TA = +85°C

Figure 47. Large Signal Pulse Response at Various TA with Two-Diode

Forward Voltages, Rising Edge, AV = 40, VS = ±110 V, VOUT = 200 V p-p,

RF = 100 kΩ, RLOAD = 10 kΩ, RADJ= 0 Ω

–150

–100

–50

100

150

TIME (2µs/DIV)

TA = –40°C

TA = 0°C

TA = +25°C

TA = +85°C

Figure 48. Large Signal Pulse Response at Various TA with Two-Diode

Forward Voltages, Falling Edge, AV = 40, VS = ±110 V, VOUT = 200 V p-p,

RF = 100 kΩ, RLOAD = 10 kΩ, RADJ = 0 Ω

DIGITAL GROUND (DGND)

DGND is the reference for all low voltage pins of the amplifier

(RADJ, TMP, and SD) and serves as a signal ground for

communication to a microprocessor or other low voltage logic

circuit. Connect DGND to a 0 V digital ground or analog

ground. Do not float DGND.

RESISTOR ADJUSTABLE QUIESCENT CURRENT

(RADJ)

To reduce further power consumption, the quiescent current of

the ADHV4702-1 can be adjusted by placing a resistor (RADJ)

between the RADJ pin and DGND.

To fully bias the amplifier, short the RADJ pin directly to

DGND to allow maximum dynamic performance. To bias the

amplifier with minimum quiescent power consumption, place a

100 kΩ resistor from RADJ to DGND. This resistor reduces

quiescent supply current to approximately 0.6 mA. Operating

the amplifier at a lower quiescent current has minimal effect on

dc performance but can result in an associated reduction in

dynamic performance, such as bandwidth and noise. Figure 49

and Figure 50 show the small signal frequency response and

noise performance at various RADJ values.

–8

–7

–6

–5

–4

–3

–2

–1

10k

100k

10M

100M

FREQUENCY (Hz)

RADJ = 0Ω

RADJ = 50kΩ

RADJ = 100kΩ

Figure 49. Small Signal Frequency Response at Various RADJ, TA = 25°C, AV = 1,

VS = ±110 V, VOUT = 100 mV p-p, RF = 0 Ω, RLOAD = 10 kΩ

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