S/(N + D) (dB) LTC1406 Low Power, 8-Bit, 20Msps, Sampling A/D Converter FEATURES DESCRIPTION n Low Power, 8-Bit, 20Msps ADC The LTC 1406 is a 20Msps, 8-bit, sampling A/D converter n 250MHz Internal Sample-and-Hold which draws only 150mW from a single 5V supply. This n 7 Effective Bits at 70MHz Input Frequency easy-to-use device includes a high dynamic range sample- n 1LSB DNL and INL Max and-hold with a 250MHz bandwidth. n Single 5V Supply and 150mW Dissipation The LTC1406s full-scale input range is 1V. The inputs n Power Down to 1A can be driven differentially or one input can be tied to a n True Differential Inputs Reject Common Mode Noise fixed voltage and the other input driven with a 1V bipolar n Accepts Single-Ended or Differential Input Signals input. Maximum DC specifications include 1LSB DNL n 1V Differential or 2V Single-Ended Input Span and INL over temperature. Outstanding AC performance n Analog Inputs Common Mode to V and GND DD includes 48.5dB S/(N + D) and 62dB THD with a 1MHz n 24-Pin Narrow SSOP Package input 47.5dB S/(N + D) and 59dB THD at the Nyquist input frequency of 10MHz. U APPLICATIONS The unique differential input sample-and-hold can acquire single-ended or differential input signals up to its 250MHz n Telecommunications bandwidth. The 60dB common mode rejection allows n Wireless Communications users to eliminate ground loops and common mode noise n Digital Cellular Telephones by measuring signals differentially from the source. n CCDs and Image Scanners n The ADC has an 8-bit parallel output port with separate Video Digitizing and Digital Television n power supply and ground allowing easy interface to 3V Digital Color Copiers n High Speed Undersampling digital systems. The pipelined architecture has five clock n cycles of data latency. Personal Computer Video n High Speed Data Acquisition , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION Effective Bits and Signal-to-Noise + Distortion Low Power, 20MHz, 8-Bit Sampling ADC vs Input Frequency DV DGND OV DD DD 12 11 2 850 24 CLOCK CLK CIRCUITRY 7 44 23 OF/UF 6 38 22 D7 21 5 32 D6 7 DIGITAL + 20 A IN D5 DATA 4 8-BIT 19 TRACK-AND- OUTPUT PIPELINE D4 HOLD AMP DRIVERS 3 8 18 ADC D3 A IN 17 2 D2 16 2.2V D1 1 15 2.5k 1.95k D0 0 100k 1M 10M 100M 94 10 3 5 6 1 INPUT FREQUENCY (Hz) 1406 BD 1406 TA02 AV V AGND SHDN AGND V OGND DD BIAS REF 1 EFFECTIVE BITS U ULTC1406 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION AV = OV = DV = V (Notes 1, 2) DD DD DD DD TOP VIEW ORDER PART Supply Voltage (V ) ................................................. 6V DD NUMBER OGND 1 24 CLK Analog Input Voltage (Note 3) .... 0.3V to (V + 0.3V) DD OV 2 23 OF/UF DD Digital Input Voltage (Note 4) .................. 0.3V to 10V SHDN 3 22 D7 LTC1406CGN Digital Output Voltage................. 0.3V to (V + 0.3V) DD V 4 21 D6 LTC1406IGN BIAS Power Dissipation.............................................. 500mW V 5 20 D5 REF Ambient Operation Temperature Range AGND 6 19 D4 LTC1406C................................................ 0C to 70C + A 7 18 D3 IN LTC1406I............................................ 40C to 85C A 8 17 D2 IN Storage Temperature Range ................. 65C to 150C AV 9 16 D1 DD Lead Temperature (Soldering, 10 sec).................. 300C AGND 10 15 D0 DGND 11 14 NC DV 12 13 NC DD GN PACKAGE 24-LEAD PLASTIC SSOP T = 110C, = 85C/ W JMAX JA Consult factory for Military grade parts. CO VERTERCCHARA TERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25C. A (Notes 5, 6) PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution (No Missing Codes) l 8 Bits Integral Linearity Error (Note 7) l 0.5 1 LSB Differential Linearity Error l 0.25 1 LSB Offset Error (Note 8) l 1 8 LSB Gain Error With External 2.5V Reference 1 5 LSB (Note 5) A ALOG I PUT The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25C. A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS + V Analog Input Span (A ) (A ) (Note 9) 4.75V V 5.25V l 1V IN IN IN DD + + Input (A or A ) Range Voltage On Either A or A l0V V IN IN IN IN DD I Analog Input Leakage Current CLK = 0 l 5 A IN C Analog Input Capacitance CLK = 1 4 pF IN CLK = 0 2 pF Input Bandwidth 250 MHz t Sample-and-Hold Aperture Delay Time 3 ns AP t Sample-and-Hold Aperture Delay Time Jitter 5 ps jitter RMS + CMRR Analog Input Common Mode Rejection Ratio 2.5V < (A = A ) < 2.5V 60 dB IN IN V Internal Bias Voltage No Load 2.2 V BIAS 2 U U U U W U W U WW