Fully differential RF ADC Driver XT06 DATA SHEET FEATURES FUNCTIONAL BLOCK DIAGRAM 3 db bandwidth of up to 350 MHz Adjustable output common-mode voltage Externally adjustable gain Slew rate 880 V/us at least Output voltage swing 9 V HIGHLIGHTS Typical folded cascode electrical scheme in schematic basis Input stage cascade implemented in CMOS transistors providing low input bias current Two versions with different conductivity types of input differential stage TYPICAL APPLICATION CIRCUIT APPLICATIONS ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers DELIVERABLES Datasheet GDSII database Customer support GENERAL DESCRIPTION The is a fully differential RF driver designed for differential signal processing applications. The driver can be used as a single-ended-to-differential amplifier or a differentialto-differential amplifier. Gain is adjusted externally by connected resistors. The device uses an internal feedback structure providing balanced output gain and phase matching. The common-mode level of differential outputs is adjusted by «Vocm» voltage that allows to shift 1/6 info@
easily the input signals for driving single-supply ADCs. The driver operation is specified over the industrial temperature range (-40 C to +85 C). GDSII database contains a ring of pads with built-in ESD protection up to 2000 V. 2/6 info@
LIST OF CONTENTS Features 1 Functional block diagram 1 Typical application circuit 1 Highlights 1 Applications 1 Deliverables 1 General description 1 Device parameters 4 Pin configuration 5 Pin functional description 5 Esd-protection 5 Equivalent circuits 6 Timing diagram 6 3/6 info@
DEVICE PARAMETERS VDDA = 4.5..5.5 V; VSSA = -VDDA; VCM = 0; T = -40..85 0 С, unless otherwise noted. Parameter Nmos Pmos Conditions Min Typ Max Min Typ Max DYNAMIC PERFORMANCE -3 db large signal bandwidth, MHz VOUT = 2 V p-p, CF = 0 pf 284 320 355 213 236 257 Slew rate, V/us VOUT = 2 V p-p, CF = 0 pf 883 967 1174 1403 1524 2105 Settling time, ns 0,5%, VOUT = 2 V p-p, CF = 1 pf 24 25 27 15 16 18 Overdrive recovery VIN = 2.5В to 0В step, G time, ns = +2 11 11 23 13 14 18 Bandwidth for 0.1 db flatness, MHz VOUT = 2 V p-p, CF = 0 pf 22 23 26 27 28 28 NOISE/HARMONIC PERFORMANCE Second/third harmonic, dbc (rectangular mode, CF = 1 pf) SFDR, dbc (cosine4 mode, CF = 1 pf) VOUT = 2 V p-p, 5 MHz, VOUT = 2 V p-p, 20 MHz, VOUT = 2 V p-p, 70 MHz, VOUT = 2 V p-p, 5 MHz, VOUT = 2 V p-p, 20 MHz, VOUT = 2 V p-p, 70 MHz, -92/ -82-72 -53/ -26-93/ -91-74 -57/ -26-93/ -100-80 -60/ -26-85/ -76-70/ -64-60/ -23-82 -71/ -70-66/ -34-83 -71/ -74-61/ -42 84 87 92 80 91 93 71 73 77 70 73 84 26 27 27 24 35 43 IMD, dbc 20,0/20,5 MHz, cosine4-59 -67-69 -52-52 -53 Voltage noise (RTI), nv/ Hz Input current noise, pa/ Hz f = 100 КГц.. 40 MHz 13 15 16 18 21 22 f = 100 КГц.. 40 MHz 13 15 17 19 21 23 INPUT CHARACTERISICS Offset voltage, mv VOS, dm = VOUT, dm/2; VDIN+ = VDIN = VOCM = 0 V 11 13 15 20 24 26 Input common-mode voltage, V -3.4.. 4.4-3.6.. 4.8-4.2.. 5.4-4.7.. 2.3-5.1.. 2.9-5.4.. 3.5 Vocm -3 db large signal bandwidth, MHz 245 265 303 191 216 218 Input capacitance, пф 0.24 0.32 0.33 0.32 0.32 0.33 CMRR, db -87-88 -89-85 -90-91 Differential 0.024 0.025 0.033 0.024 0.025 0.025 Input resistance, MΩ Common mode 0.012 0.012 0.013 0.012 0.012 0.012 OUTPUT CHARACTERISICS Output voltage swing, VOUT; G = +1, RL,dm = 7 9 10 8 9 10 V 499Ω Quiescent current, ma 26 32 39 23 32 40 Shorted outputs, VOUT = Output current, ма 2 V p-p, 500 KHz, CF = 1 73 97 121 84 108 134 pf 4/6 info@
PIN CONFIGURATION Figure 1. Pin configuration PIN FUNCTIONAL DESCRIPTION Pin name Description Comments 1 INM_PAD Input signal (-) 2 VCM_PAD Common mode voltage input 3 VDDA Supply Typical value: 5 V 4 OUTP_PAD Output signal (+) 5 OUTM_PAD Output signal (-) 6 VSSA Ground Typical value: -5 V 7 VSSA Ground Typical value: -5 V 8 INP_PAD Input signal (+) ESD-PROTECTION ESD-protection of not less than 2 kv level for HBM discharge is provided for all analog inputs and outputs of the differential driver. 5/6 info@
EQUIVALENT CIRCUITS PAD I/O ESDstructure Figure 2. Analog input/output TIMING DIAGRAM Figure 3. Timing diagram of the driver, G=1 6/6 info@