AD8370AREZ-RL7

LF to 750 MHz, Digitally Controlled VGA AD8370 Data Sheet FEATURES FUNCTIONAL BLOCK DIAGRAM PWUP 4 ICOM 2 INHI 1 GENERAL DESCRIPTION The AD8370 is a low cost, digitally controlled, variable gain amplifier (VGA) that provides precision gain control, high IP3, and low noise figure. The excellent distortion performance and wide bandwidth make the AD8370 a suitable gain control device for modern receiver designs. For wide input, dynamic range applications, the AD8370 provides two input ranges: high gain mode and low gain mode. A vernier, 7-bit, transconductance (gm) stage provides 28 dB of gain range at better than 2 dB resolution and 22 dB of gain range at better than 1 dB resolution. A second gain range, 17 dB higher than the first, can be selected to provide improved noise performance. The AD8370 is powered on by applying the appropriate logic level to the PWUP pin. When powered down, the AD8370 consumes less than 4 mA and offers excellent input to output isolation. The gain setting is preserved when operating in a power-down mode. VCCO VCCO 3 11 6 BIAS CELL PRE AMP TRANSCONDUCTANCE 5 VOCM 7 OCOM 8 OPHI 9 OPLO OUTPUT AMP INLO 16 10 OCOM ICOM 15 SHIFT REGISTER AND LATCHES 13 03692-001 AD8370 14 12 DATA CLCK LTCH Figure 1. 70 APPLICATIONS 40 CODE = LAST 7 BITS OF GAIN CODE (NO MSB) 60 30 50 20 LOW GAIN MODE 40  GAIN  0.409  CODE HIGH GAIN MODE 30 10 0 20 –10 10 LOW GAIN MODE 0 0 10 20 30 40 50 60 70 80 GAIN CODE  GAIN  0.059  CODE –20 –30 90 100 110 120 130 VOLTAGE GAIN (dB) HIGH GAIN MODE VOLTAGE GAIN (V/V) Differential ADC drivers IF sampling receivers RF/IF gain stages Cable and video applications SAW filter interfacing Single-ended-to-differential conversion VCCI 03692-002 Programmable low and high gain (