Motore di ricerca datesheet componenti elettronici |
|
AD10465BZ Scheda tecnica(PDF) 9 Page - Analog Devices |
|
AD10465BZ Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 20 page REV. 0 AD10465 –9– CURRENT MIRROR DR OUT DVCC VREF CURRENT MIRROR DVCC Figure 4. Digital Output Stage CURRENT MIRROR D0–D13 DVCC VREF CURRENT MIRROR DVCC 100 Figure 5. Digital Output Stage AVIN3 AVIN2 AVIN1 200 100 100 TO AD8037 Figure 2. Analog Input Stage LOADS LOADS 10k 10k ENCODE AVCC AVCC 10k 10k ENCODE AVCC AVCC Figure 3. ENCODE Inputs THEORY OF OPERATION The AD10465 is a high dynamic range 14-bit, 65 MHz pipeline delay (three pipelines) analog-to-digital converter. The custom analog input section maintains the same input ranges (1 V p-p, 2 V p-p, and 4 V p-p) and input impedance (100 Ω, 200 Ω, and 400 Ω) as the AD10242. The AD10465 employs four monolithic ADI components per channel (AD8037, AD8138, AD8031, and AD6644), along with multiple passive resistor networks and decoupling capacitors to fully integrate a complete 14-bit analog-to-digital converter. The input signal is passed through a precision laser-trimmed resistor divider allowing the user to externally select operation with a full-scale signal of ±0.5 V, ±1.0 V or ±2.0 V by choosing the proper input terminal for the application. The AD10465 analog input includes an AD8037 amplifier featuring an innovative architecture that maximizes the dynamic range capability on the amplifiers inputs and outputs. The AD8037 amplifier provides a high input impedance and gain for driving the AD8138 in a single-ended to differential amplifier configu- ration. The AD8138 has a –3 dB bandwidth at 300 MHz and delivers a differential signal with the lowest harmonic distortion available in a differential amplifier. The AD8138 differential outputs help balance the differential inputs to the AD6644, maximizing the performance of the ADC. The AD8031 provides the buffer for the internal reference of the AD6644. The internal reference voltage of the AD6644 is designed to track the offsets and drifts of the ADC and is used to ensure matching over an extended temperature range of operation. The reference voltage is connected to the output common mode input on the AD8138. The AD6644 reference voltage sets the output common-mode on the AD8138 at 2.4 V, which is the midsupply level for the AD6644. The AD6644 has complementary analog input pins, AIN and AIN. Each analog input is centered at 2.4 V and should swing ±0.55 V around this reference. Since AIN and AIN are 180 degrees out of phase, the differential analog input signal is 2.2 V peak-to-peak. Both analog inputs are buffered prior to the first track-and-hold, TH1. The high state of the ENCODE pulse places TH1 in hold mode. The held value of TH1 is applied to the input of a 5-bit coarse ADC1. The digital output of ADC1 drives 14 bits of precision which is achieved through laser trimming. The output of DAC1 is subtracted from the delayed analog signal at the input of TH3 to generate a first residue signal. TH2 provides an analog pipeline delay to compensate for the digital delay of ADC1. The first residue signal is applied to a second conversion stage consisting of a 5-bit ADC2, 5-bit DAC2, and pipeline TH4. The second DAC requires 10 bits of precision which is met by the process with no trim. The input to TH5 is a second residue signal generated by subtracting the quantized output of DAC2 from the first residue signal held by TH4. TH5 drives a final 6-bit ADC3. The digital outputs from ADC1, ADC2, and ADC3 are added together and corrected in the digital error correction logic to generate the final output data. The result is a 14-bit parallel digital CMOS-compatible word, coded as two’s complement. USING THE FLEXIBLE INPUT The AD10465 has been designed with the user’s ease of opera- tion in mind. Multiple input configurations have been included on board to allow the user a choice of input signal levels and input impedance. While the standard inputs are ±0.5 V, ±1.0 V and ±2.0 V, the user can select the input impedance of the |
Codice articolo simile - AD10465BZ |
|
Descrizione simile - AD10465BZ |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |