AD7495 Analog Devices, AD7495 Datasheet
AD7495
Specifications of AD7495
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AD7495 Summary of contents
Page 1
... AD7495 consumes 2 mA. With 5 V supplies and 1 MSPS, the current consumption is 2.1 mA for the AD7475 and 2.6 mA for the AD7495. The analog input range for the parts REF IN. The 2.5 V reference for the AD7475 is applied externally to the REF IN pin, while the AD7495 has an on-board 2 ...
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... Updated Outline Dimensions ....................................................... 23 Changes to Ordering Guide .......................................................... 24 Operating Modes............................................................................ 16 Normal Mode.............................................................................. 16 Partial Power-Down Mode ....................................................... 16 Full Power-Down Mode ............................................................ 17 Power vs. Throughput Rate....................................................... 19 Serial Interface ................................................................................ 20 Microprocessor Interfacing........................................................... 21 AD7475/AD7495 to TMS320C5 AD7475/AD7495 to ADSP-21 AD7475/AD7495 to DSP56 AD7475/AD7495 to MC68HC16............................................. 22 Outline Dimensions ....................................................................... 23 Ordering Guide .......................................................................... 24 Rev Page /C54 ................................. ............................................. 21 XX ............................................... 22 XXX ...
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... Straight (Natural) Binary 800 800 ns max 300 300 ns max 325 325 ns max 1 1 MSPS max Rev Page AD7475/AD7495 = unless otherwise noted. A MIN MAX Test Conditions/Comments f = 300 kHz sine wave 300 kHz sine wave 300 kHz sine wave, f ...
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... AD7475/AD7495 Parameter POWER REQUIREMENTS DRIVE Normal Mode (Static) Normal Mode (Operational) Partial Power-Down Mode Partial Power-Down Mode Full Power-Down Mode Power Dissipation Normal Mode (Operational) Partial Power-Down (Static) Full Power-Down 1 Temperature ranges for A, B versions: −40°C to +85°C. ...
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... AD7495 SPECIFICATIONS DRIVE Table 2. Parameter DYNAMIC PERFORMANCE Signal-to-Noise and Distortion (SINAD) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth Full Power Bandwidth ...
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... AD7475/AD7495 Parameter POWER REQUIREMENTS DRIVE I DD Normal Mode (Static) Normal Mode (Operational) Partial Power-Down Mode Partial Power-Down Mode Full Power-Down Mode 3 Power Dissipation Normal Mode (Operational) Partial Power-Down (Static) Full Power-Down 1 Temperature ranges for A, B versions: −40°C to +85°C. ...
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... SCLK falling edge to SDATA high impedance ns max SCLK falling edge to SDATA high impedance ns max CS rising edge to SDATA high impedance μs max Power-up time from full power-down (AD7475) μs max Power-up time from full power-down (AD7495) Rev Page AD7475/AD7495 unless otherwise noted. MIN MAX = 1/f ...
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... AD7475/AD7495 TIMING EXAMPLE 1 With MHz and a throughput of 1 MSPS, the cycle SCLK time 12.5(1 μs. With t 2 SCLK ACQ is 365 ns. The 365 ns satisfies the requirement of 300 ns for t In Figure 3, t comprises 2.5(1 ACQ SCLK 45 ns. This allows a value of 195 ns for t minimum requirement of 100 ns ...
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... 0.3 V device reliability. DD −0 0.3 V DRIVE −0 0 ±10 mA −40°C to +85°C −65°C to +150°C 150°C 450 mW 157°C/W (SOIC) 205.9°C/W (MSOP) 56°C/W (SOIC) 43.74°C/W (MSOP) 215°C 220° Rev Page AD7475/AD7495 ...
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... V ± 1% for specified performance. A cap of a least 0.1 μF should be placed on the REF IN pin. 1 (AD7495) REF OUT Reference Output for the AD7495. A minimum 100 nF capacitance is required from this pin to GND. The internal reference can be taken from this pin, but buffering is required before it is applied elsewhere in a system Analog Input ...
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... The AD7475/AD7495 are tested using the CCIF standard where two input frequencies near the top end of the input bandwidth are used. In this case, the second-order terms are usually ...
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... FREQUENCY (kHz) Figure 7. AD7475 Dynamic Performance Figure 8 shows a typical FFT plot for the AD7495 MHz sample rate and a 100 kHz input frequency. –15 –35 –55 –75 –95 –115 0 50 100 150 ...
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... The AD7475/AD7495 are fast, micropower, 12-bit, single- supply analog-to-digital converters (ADCs). The parts can be operated from a 2 5.25 V supply. When operated from either supply supply, the AD7475/AD7495 are capable of throughput rates of 1 MSPS when provided with a 20 MHz clock. ...
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... V supply of the microprocessor to allow logic interface (see the Digital Inputs section.) In Figure 15, the REF OUT pin of the AD7495 is connected to a buffer and then applied to a level-shifting circuit used on the analog input to allow a bipolar signal to be applied to the AD7495. A minimum 100 nF capacitance is required on the REF OUT pin to GND ...
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... REF IN pin. Suitable reference sources for the AD7475 are the AD780, AD680, AD1582, ADR391, ADR381, ADR431, and ADR03. The AD7495 contains an on-chip 2.5 V reference. As shown in Figure 18, the voltage that appears at the REF OUT pin is internally buffered before being applied to the ADC; the output impedance of this buffer is typically 10 Ω ...
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... When the AD7475 is in partial power-down, all analog circuitry is powered down except for the bias current generator; and, in the case of the AD7495, all analog circuitry is powered down except for the on-chip reference and reference buffer. ...
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... QUIET, goes back into three-state after the dummy conversion to the next falling edge When running MSPS throughput rate, the AD7475/AD7495 power up and acquire a signal within ±0.5 LSB in one dummy cycle, 1 μs. THE PART BEGINS TO POWER UP ...
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... For the AD7495, enough time should be allowed for the internal reference buffer to charge the reference capacitor. Then, to place the AD7475/ AD7495 in normal mode, a dummy cycle, 1 μs, should be initiated. If the first valid conversion is then performed directly after the dummy conversion, ensure that adequate acquisition time has been allowed ...
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... Full power-down mode is intended for use in applications with slower throughput rates than required for partial power-down AD7495 3V mode necessary to leave 650 μs for the AD7495 to be fully SCLK = 20MHz powered up from full power-down before initiating a conver- sion. Current consumptions between conversions is typically less than 1 μ ...
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... THREE-STATE FOUR LEADING ZEROS Sixteen serial clock cycles are required to perform the con- version process and to access data from the AD7475/AD7495. CS going low provides the first leading zero to be read in by the microcontroller or DSP. The remaining data is then clocked out by subsequent SCLK falling edges beginning with the second leading zero ...
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... AD7475/AD7495 TO ADSP-21 The ADSP-21xx family of DSPs is interfaced directly to the AD7475/AD7495 without any glue logic required. The V pin of the AD7475/AD7495 takes the same supply voltage as that of the ADSP-21xx. This allows the ADC to operate at a higher voltage than the serial interface, that is, ADSP-21xx, if ...
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... Bit WL0 = 0 in CRA. For signal processing applications imperative that the frame synchronization signal from the DSP56xxx provide equidistant sampling. The V AD7475/AD7495 takes the same supply voltage as that of the DSP56xxx. This allows the ADC to operate at a voltage higher than the serial interface, that is, DSP56xxx, if necessary. ...
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... Dimensions shown in millimeters and (inches) 3.00 BSC 8 5 3.00 4.90 BSC BSC 1 4 PIN 1 0.65 BSC 1.10 MAX 0.15 0.00 0.38 0.23 0.22 0.08 COPLANARITY SEATING 0.10 PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 33. 8-Lead Mini Small Outline Package [MINI_SO] (RM-8) Dimensions shown in millimeters Rev Page AD7475/AD7495 0.50 (0.0196) × 45° 0.25 (0.0099) 8° 1.27 (0.0500) 0° 0.40 (0.0157) 0.80 8° 0.60 0° 0.40 ...
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... AD7495ARM −40°C to +85°C AD7495ARM-REEL −40°C to +85°C AD7495ARM-REEL7 −40°C to +85°C AD7495ARMZ 3 −40°C to +85°C 3 AD7495ARMZ-REEL −40°C to +85°C 3 AD7495ARMZ-REEL7 −40°C to +85°C AD7495BRM −40°C to +85°C AD7495BRM-REEL −40°C to +85°C AD7495BRM-REEL7 − ...