AD8336 General-Purpose, −55°C to +125°C, Wide Bandwidth, DC-Coupled VGA

The AD8336 is a low noise, single-ended, linear in dB, general-purpose variable gain amplifier, usable over a large range of supply voltages. It features an uncommitted preamplifier with a usable gain range of 6 dB to 26 dB. The VGA gain range is 0 dB to 60 dB, with absolute gain limits of −26 dB to +34 dB. When the preamplifier gain is adjusted for 12 dB, the combined 3 dB bandwidth of the preamplifier and VGA is 100 MHz, and the amplifier is fully usable to 80 MHz. With ±5 V supplies, the maximum output swing is 7 V p-p.

Because of the X-AMP® architecture, frequency response is maintained across the entire gain range of the VGA. The differential gain control interface provides precise linear in dB gain scaling of 50 dB/V over the temperature span of −55°C to +125°C and is simple to interface with a variety of external sources.

The large supply voltage range makes the AD8336 suited for industrial medical applications and video circuits. Dual-supply operation enables bipolar input signals, such as those generated by photodiodes or photomultiplier tubes.

The fully independent voltage feedback preamplifier allows both inverting and noninverting gain topologies. The AD8336 can be used within the specified gain range of −14 dB to +60 dB by selecting a preamplifier gain between 6 dB and 26 dB and choosing appropriate feedback resistors. For the nominal preamplifier gain of 4×, the overall gain range is −14 dB to +46 dB.

If required, quiescent power is limited to a safe level by asserting the PWRA pin.

Applications

Features and Benefits

Low noise

Voltage noise: 3 nV/√Hz
Current noise: 3 pA/√Hz

Voltage noise: 3 nV/√Hz

Current noise: 3 pA/√Hz

Small-signal BW: 115 MHz

Large-signal BW: 2 V p-p = 80 MHz

Slew rate: 550 V/μs, 2 V p-p

Gain ranges (specified)

−14 dB to +46 dB
0 dB to 60 dB

−14 dB to +46 dB

0 dB to 60 dB

Gain scaling: 50 dB/V

DC-coupled

Single-ended input and output

Supplies: ±3 V to ±12 V

Temperature range: −55°C to +125°C

Power

150 mW at ±3 V, −55°C < T < +125°C
84 mW at ±3 V, PWRA = 3 V

150 mW at ±3 V, −55°C < T < +125°C

84 mW at ±3 V, PWRA = 3 V

Amplifiers

SPICE Models

AD8336 SPICE Macro Model .CIR

Data Sheets

Document	note
AD8336: General-Purpose, −55°C to +125°C, Wide Bandwidth, DC-Coupled VGA Data Sheet (Rev. E)	PDF 793.77 K

Application Notes

Document	note
AN-934: 60 dB Wide Dynamic Range, Low Frequency AGC Circuit Using a Single VGA (Rev. 0)	PDF 317 kB

Frequently Asked Questions

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8336ACPZ-R7 Production	16 ld LFCSP (4x4mm, 2.1mm exposed pad)	REEL 1500	-40 to 85C	0	4.65	Y
AD8336ACPZ-RL Production	16 ld LFCSP (4x4mm, 2.1mm exposed pad)	REEL 5000	-40 to 85C	0	4.65	Y
AD8336ACPZ-WP Production	16 ld LFCSP (4x4mm, 2.1mm exposed pad)	REEL 64	-40 to 85C	5.66	4.65	Y