AD8322ARU Analog Devices Inc, AD8322ARU Datasheet
AD8322ARU
Specifications of AD8322ARU
Available stocks
Related parts for AD8322ARU
AD8322ARU Summary of contents
Page 1
GENERAL DESCRIPTION The AD8322 is a low-cost, digitally controlled variable gain ampli- fier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output ...
Page 2
AD8322–SPECIFICATIONS Parameter INPUT CHARACTERISTICS Specified AC Voltage Noise Figure Input Resistance Input Capacitance GAIN CONTROL INTERFACE Gain Range Maximum Gain Minimum Gain Gain Scaling Factor OUTPUT CHARACTERISTICS Bandwidth (–3 dB) Bandwidth Roll-Off Bandwidth Peaking Output Noise 1 dB Compression Point ...
Page 3
LOGIC INPUTS (TTL/CMOS Compatible Logic) Parameter Logic “1” Voltage Logic “0” Voltage = 5 V) CLK, SDATA, DATEN Logic “1” Current (V INH = 0 V) CLK, SDATA, DATEN Logic “0” Current (V INL = Logic “1” ...
Page 4
... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Model Temperature Range AD8322ARU –40°C to +85°C AD8322ARU-REEL –40°C to +85°C AD8322-EVAL Thermal Resistance measured on SEMI standard 4-layer board. 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 ...
Page 5
432 75 0.1 F –1 0. 10MHz 0.10 0.05 0. 5MHz f = 42MHz –0.05 –0. 65MHz –0.15 –0.20 –0.25 –0.30 –0. ...
Page 6
AD8322 –10 –20 MAX GAIN –30 –40 –50 MIN GAIN –60 –70 –80 GAIN CODE 0 –90 –100 1 10 FREQUENCY – MHz – 62dBmV O at MAX GAIN – 60dBmV O ...
Page 7
APPLICATIONS General Application The AD8322 is primarily intended for use as the upstream power amplifier (PA) in DOCSIS (Data Over Cable Service Interface Specifications) certified cable modems and CATV set-top boxes. Upstream data is modulated in QPSK or QAM format. ...
Page 8
AD8322 25V SDATA CLK DATEN 0 0.1 F 0.1 F Output Bias, Impedance, and Termination The differential output pins V and V OUT level of approximately V /2. Therefore, the outputs ...
Page 9
... The ability of the PULSE diplexer to –54.4 –54.1 achieve DOCSIS compliance is neither expressed nor implied by –54.3 –53.7 Analog Devices Inc. Data on the diplexer should be obtained –53.8 –53.5 from PULSE. Differential Inputs The AD8322-EVAL evaluation board is designed to accommo- date a Mini-Circuits T1-6T-KK81 1:1 transformer for the purpose of converting a single-ended (ground referenced) input signal to differential inputs ...
Page 10
AD8322 Single-Ended-to-Differential Input (Figure 8 Option 1) Install the Mini-Circuits T1-6T-KK81 1:1 transformer in the T1 location of the evaluation board. Install 0 Ω chip resistors in R12, R13, and R17, and leave R14, R16, and R19 open. For 75 ...
Page 11
AD8322 ...
Page 12
AD8322 ...
Page 13
AD8322 ...
Page 14
TP15 VCC 1 RED J1 C18 + 1 SDATA 10 F TP20 2 25V CLK 3 DATEN BLK AGND 0 0.1 F ...
Page 15
AD8322 Evaluation Board Rev. DC SINGLE-ENDED INVERTING INPUT – Revised – June 22, 2000 Qty. Description 10 µ ‘C’ size tantalum chip capacitor 1 0.1 µ 1206 size ceramic chip capacitor 1/8 W. ...
Page 16
AD8322 PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead TSSOP (RU-28) 0.386 (9.80) 0.378 (9.60 0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25 0.0433 (1.10) MAX 8 ...