DATASHEET ISL55211 FN7868 Rev 0.00 Wideband, Low Noise, Low Distortion, Fixed Gain, Differential Amplifier June 21, 2011 The ISL55211 is a wideband, differential input to differential Features output amplifier offering 3 possible internal gain settings. 3 Fixed Gain Options . 2, 4, or 5V/V Using fixed 500 internal feedback resistors, the amplifier may be configured for a differential gain of 2, 4 or 5V/V Constant Bandwidth Over Gain 1.4GHz depending on which combination of input pins are connected Differential Slew Rate . 5,600V/s to the signal source. Internal feedback capacitors controls the 2V , 2-tone IM3 (200) 100MHz -103dBc signal bandwidth to be a constant 1.4GHz in all gain settings. P-P Low Differential Output Noise (Gain 5V/V) <12nV/Hz Ideally suited for AC-coupled data acquisition applications, the output DC common mode voltage is controlled through an Supply Voltage Range 3.0V to 4.2V external V pin or left to default to 1.2V above the negative CM Quiescent Power (3.3V Supply) 115mW supply pin. Where the differential signal source is AC-coupled, the input common mode voltage will equal the output Applications common mode voltage. Low Power, High Dynamic Range ADC Interface Intended for very high dynamic range ADC interface Differential Mixer Output Amplifier applications, the ISL55211 offers 5600V/s differential slew rate, <12nV/ Hz output noise, and >100dBc SFDR to SAW Filter Pre/Post Driver >100MHz for 2V 2-tone 3rd order intermodulation. Its P-P Fixed Gain Coax Receiver balanced architecture effectively suppresses even order distortion terms - an important issue for very wide band 1st Related Devices Nyquist zone ADC interface applications. Minimum gain operation of 2V/V (6dB) with <1dB peaking ensures stable ISL55210 - External Gain Set Version performance over-temperature. It s ultra high differential slew ISLA112P50 - 12-bit, 500MSPS ADC (<500mW) rate of 5600V/s provides adequate performance margin for ISLA214P50 - 14-bit, 500MSPS ADC (<850mW) large signal application through 500MHz. The ISL55211 requires only a single 3.3V (max. 4.2V) power supply and 35mA quiescent current, providing a very low Related Literature power solution (115mW). Further power savings are possible AN1649 - Designers guide to the ISL55210 and ISL55211 using the optional power shutdown control - where the Evaluation Boards quiescent current can be reduced to <0.4mA. A companion device, the ISL55210, offers similar performance where the feedback and gain resistors are external. Both are available in a 16 Ld TQFN (Pb-free) package and are specified for operation over the -40C to +85C ambient temperature range. +3.3V ISLA214P50 MEASURED FREQUENCY RESPONSE 35mA 23 (850mW) (115mW) 20 14Bit 500MSPS 17 ADT2-1T 50 10 14 + 120nH V 11 i 1:2 1:1.4 8 ISL55211 22pF V ADC 5 300 V CM 8pF 50 1.2V 2 G = 5V/V ADT4-1T -1 120nH -4 -7 - 10 50 180mV P-P V CM -10 For ADC -1dBFS V ADC -13 20 log = 20dB V i 1M 10M 100M 1G RD HIGH GAIN, VERY LOW POWER, ADC INTERFACE WITH 3 ORDER OUTPUT FILTER FREQUENCY (Hz) FIGURE 1. TYPICAL APPLICATION CIRCUIT FN7868 Rev 0.00 Page 1 of 20 June 21, 2011 GAIN (dB)ISL55211 Pin Configuration ISL55211 (3x3 16 LD TQFN) TOP VIEW V GND VS+ CM GND 15 16 14 13 348 500 V 1 IN2- 12 V O+ 750 0.2pF V IN1- 2 11 - NC 140 V CM 140 V IN1+ 3 10 NC + 0.2pF 750 V IN2+ 4 9 V O- 500 348 78 56 GND GND V GND S+ Pd Pin Descriptions PIN NUMBER SYMBOL DESCRIPTION 1V Balanced Differential Input for Av = 6dB, strapped to V for Av = 14dB IN2- IN1- 2V Balanced Differential Input for Av = 12dB, strapped to V for Av = 14dB IN1- IN2- 3V Balanced Differential Input for Av = 12dB, strapped to V for Av = 14dB IN1+ IN2+ 4V Balanced Differential Input for Av = 6dB, strapped to V for Av = 14dB IN2+ IN1+ 5, 8, 13, 16 GND Supply Ground (thermal pad electrically connected) 6, 15 V Positive Power Supply (3.0V~4.2V) S+ 7 Pd Power-down: Pd = logic low. Puts part into low power mode Pd = logic high or open for normal operation 9V Inverting Amplifier Output O- 10, 11 NC No Internal Connection 12 V Non-Inverting Amplifier Output O+ 14 V Common-mode Voltage Input CM Ordering Information PART NUMBER TEMP RANGE PACKAGE PKG. (Notes 1, 2, 3) PART MARKING (C) (Pb-free) DWG. ISL55211IRTZ 5211 -40 to +85 16 Ld 3x3 TQFN L16.3x3D ISL55211IRTZ-EVAL1Z Evaluation Board NOTES: 1. Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL55211. For more information on MSL please see techbrief TB363. FN7868 Rev 0.00 Page 2 of 20 June 21, 2011