Preliminary Technical Data 24dB Range, 1dB Step Size Programmable VGA AD8375 FEATURES FUNCTIONAL BLOCK DIAGRAM -4 to 20dB Gain Range 1 dB Step Size ± 0.2 dB Differential input and output 150 Ω Differential Input Open Collector Differential Output 8dB noise figure @ maximum gain OIP3 of ~50dBm at 140MHz −3 dB bandwidth of 690 MHz Parallel 5-bit Control Interface Wide input dynamic range Power-down feature Single 5V Supply Operation 24 Lead LFCSP 4 x 4 mm Package APPLICATIONS Differential ADC drivers High IF Sampling Receivers High Output Power IF Amplification Instrumentation Figure 1. GENERAL DESCRIPTION The AD8375 is a digitally controlled, variable gain wide bandwidth amplifier that provides precise gain control, high IP3 and low noise figure. The excellent distortion performance and high signal bandwidth makes the AD8375 an excellent gain control device for a variety of receiver applications. For wide input dynamic range applications, the AD8375 provides a broad 24dB gain range with 1 dB resolution. The gain is adjusted through a 5-pin control interface and can be driven using standard TTL levels. The open-collector outputs provide a flexible interface, allowing the overall signal gain to be set by the loading resistance. The AD8375 offers a maximum transconductance gain of 67 mΩ-1’s, resulting in a signal gain of 20dB when driving a 150-Ohm load. The maximum signal gain increases to ~24dB when driving a 250-Ohm differential load. Rev. PrB Using a high speed SiGe process and incorporating proprietary distortion cancellation techniques, the AD8375 achieves 50 dBm output IP3 at 140 MHz. The AD8375 is powered on by applying the appropriate logic level to the PWUP pin. The quiescent current of the AD8375 is typically 130mA. When powered down, the AD8375 consumes less than 5mA and offers excellent input to output isolation. The gain setting is preserved when powered down. Fabricated on an ADI’s high speed SiGe process, the AD8375 provides precise gain adjustment capabilities with good distortion performance. The AD8375 amplifier comes in a compact, thermally enhanced 4 x 4mm 24-lead LFCSP package and operates over the temperature range of −40°C to +85°C. March 13, 2007 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2007 Analog Devices, Inc. All rights reserved. AD8375 Preliminary Technical Data SPECIFICATIONS VS = 5 V, T = 25°C, ZS = ZL = 150Ω at 100MHz, 2 V p-p differential output unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Slew Rate INPUT STAGE Maximum Input Swing Differential Input Resistance Common-Mode Input Voltage CMRR Conditions Min VOUT < 2 V p-p (5.2dBm) Typ Max Unit 690 TBD MHz V/nsec TBD 150 2 TBD V p-p Ω V dB Pins VIN+ and VINFor linear operation (AV = 0dB) Differential Gain Code = 00000 GAIN Amplifier Transconductance 0.58 0.067 0.076 Ω-1 Maximum Voltage Gain Gain Code = 00000 Minimum Voltage Gain Gain Code ≥11000 -5.5 −4 -2.5 dB Gain Step Size From Gain Code 00000 to 11000 0.8 1.0 1.2 dB Gain Flatness TBD dB Gain Temperature Sensitivity Gain Code = 00000 over 20% fractional bandwidth for fC < 200MHz Gain Code = 00000 TBD mdB/°C Gain Step Response For VIN = 0.2V, Gain Code 10100 to 00000 TBD ns 10 5k//1 V p-p Ω/pF 8.5 -94 -92 50 19 dB dBc dBc dBm dBm 8.5 -94 -92 50 19 dB dBc dBc dBm dBm 8.5 -86 -91 50 19 dB dBc dBc dBm dBm OUTPUT STAGE Output Voltage Swing Output impedance NOISE/HARMONIC PERFORMANCE 46 MHz Noise Figure Second Harmonic Third Harmonic Output IP3 Output 1 dB Compression Point 70 MHz Noise Figure Second Harmonic Third Harmonic Output IP3 Output 1 dB Compression Point 140 MHz Noise Figure Second Harmonic Third Harmonic Output IP3 Output 1 dB Compression Point dB 20 Pins OUT+ and OUTAt P1dB, Gain Code = 00000 Differential Gain Code = 00000 VOUT = 2 V p-p VOUT = 2 V p-p 2 MHz spacing, +3 dBm per tone Gain Code = 00000 VOUT = 2 V p-p VOUT = 2 V p-p 2 MHz spacing, +3 dBm per tone Gain Code = 00000 VOUT = 2 V p-p VOUT = 2 V p-p 2 MHz spacing, +3 dBm per tone Rev. PrB | Page 2 of 6 Preliminary Technical Data Parameter 200 MHz Noise Figure Second Harmonic Third Harmonic Output IP3 Output 1 dB Compression Point POWER-INTERFACE Supply Voltage Quiescent Current per Channel vs. Temperature Power Down Current vs. Temperature ENABLE INTERFACE Enable Threshold PWUP Input Bias Current GAIN CONTROL INTERFACE VIH VIL Maximum Input Bias Current AD8375 Conditions Gain Code = 00000 Min Max 8.5 -85 -88 50 18 VOUT = 2 V p-p VOUT = 2 V p-p 2 MHz spacing, +3 dBm per tone 4.5 thermal connection made to exposed paddle under device 130 −40°C ≤ TA ≤ +85°C PWUP Low −40°C ≤TA ≤ +85°C 5.5 V 140 mA 165 mA mA mA TBD Pin PWUP Minimum voltage to enable the device Unit dB dBc dBc dBm dBm 3 1.6 0.5 V nA Pins A0, A1, A2, A3, A4 Minimum voltage for a logic high Maximum voltage for a logic low 1.6 V 0.8 900 Table 2. Gain-Code versus Voltage Gain Look-Up Table 5-Bit Binary Gain Code 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 Typ Voltage Gain (dB) 20 19 18 17 16 15 14 13 12 11 10 9 8 5-Bit Binary Gain Code 01101 01110 01111 10000 10001 10010 10011 10100 10101 10110 10111 11000 >11000 Rev. PrB | Page 3 of 6 Voltage Gain (dB) 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -4 nA AD8375 Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage, VPOS PWUP, A0, A1, A2, A3, A4 Input Voltage, VIN+ ,VINInternal Power Dissipation θJA (Exposed paddle soldered down) θJA (Exposed paddle not soldered down) θJC (At exposed paddle) Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature Range (Soldering 60 sec) Rating 5.5 V -0.6 to (VPOS + 0.6V) -0.6 to +3.1V TBD mW TBD°C/W TBD°C/W TBD°C/W TBD°C –40°C to +85°C –65°C to +150°C TBD°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. PrB | Page 4 of 6 Preliminary Technical Data AD8375 PIN CONFIGURATION AND FUNCTIONAL DESCRIPTIONS Figure 2. 24 Lead LFCSP Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9, 10,12, 13, 23 11, 14, 20, 21, 22, 24 15, 17 16, 18 19 Mnemonic VCOM VIN+ VINA4 A3 A2 A1 A0 VPOS Description Common Mode Pin. Typically bypassed to ground using external capacitor. Voltage Input Positive. Voltage Input Negative. The Most Significant Bit (MSB) for the 5-bit Gain Control Interface. MSB-1 for the Gain Control Interface. MSB-2 for the Gain Control Interface. LSB+1 for the Gain Control Interface. The Least Significant Bit (LSB) for the 5-bit Gain Control Interface. Positive Supply Pins. Should be bypassed to Ground using suitable bypass capacitor. COMM Device Common (DC Ground). VOUT+ VOUTPWUP Positive Ouptut Pins (Open Collector). Require DC bias of +5V nominal. Negative Ouptut Pins (Open Collector). Require DC bias of +5V nominal. Chip Enable Pin. Rev. PrB | Page 5 of 6 AD8375 Preliminary Technical Data OUTLINE DIMENSIONS Figure2. 24-Lead LFCSP) ORDERING GUIDE Model AD8375ACPZ-WP AD8375ACPZ-REEL7 AD8375-EVALZ Temperature –40°C to +85°C –40°C to +85°C Package Description Waffle Pack, 24 Lead Frame Chip Scale Package 7” Reel, 24 Lead Frame Chip Scale Package Evaluation Board © 2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR06724-0-3/07(PrB) Rev. PrB | Page 6 of 6 Package Option CP-24 CP-24