The ADC34J2x are a high-linearity, ultra-low power, dual-channel, 12-bit, 50-MSPS to 160-MSPS, analog-to-digital converter (ADC) family. The devices are designed specifically to support demanding, high input frequency signals with large dynamic range requirements. A clock input divider allows more flexibility for system clock architecture design while the SYSREF input enables complete system synchronization. The devices support JESD204B interfaces in order to reduce the number of interface lines, thus allowing for high system integration density. The JESD204B interface is a serial interface, where the data of each ADC are serialized and output over only one differential pair. An internal phase-locked loop (PLL) multiplies the incoming ADC sampling clock by 20 to derive the bit clock that is used to serialize the 12-bit data from each channel. The devices support subclass 1 with interface speeds up to 3.2 Gbps.
PART NUMBER | PACKAGE | SAMPLING RATE (MSPS) |
---|---|---|
ADC34J22 | VQFN (48) | 50 |
ADC34J23 | 80 | |
ADC34J24 | 125 | |
ADC34J25 | 160 |
Changes from * Revision (May 2014) to A Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
AVDD | 4, 5, 8, 9, 12, 17, 20, 25, 28, 29, 32, 39, 46 | I | Analog 1.8-V power supply |
CLKM | 18 | I | Negative differential clock input for the ADC |
CLKP | 19 | I | Positive differential clock input for the ADC |
DAM | 48 | O | Negative serial JESD204B output for channel A |
DAP | 47 | O | Positive serial JESD204B output for channel A |
DBM | 45 | O | Negative serial JESD204B output for channel B |
DBP | 44 | O | Positive serial JESD204B output for channel B |
DCM | 41 | O | Negative serial JESD204B output for channel C |
DCP | 40 | O | Positive serial JESD204B output for channel C |
DDM | 38 | O | Negative serial JESD204B output for channel D |
DDP | 37 | O | Positive serial JESD204B output for channel D |
DVDD | 3, 34 | I | Digital 1.8-V power supply |
GND | PowerPAD™ | I | Ground, 0 V |
INAM | 6 | I | Negative differential analog input for channel A |
INAP | 7 | I | Positive differential analog input for channel A |
INBM | 11 | I | Negative differential analog input for channel B |
INBP | 10 | I | Positive differential analog input for channel B |
INCM | 26 | I | Negative differential analog input for channel C |
INCP | 27 | I | Positive differential analog input for channel C |
INDM | 31 | I | Negative differential analog input for channel D |
INDP | 30 | I | Positive differential analog input for channel D |
OVRA | 2 | O | Overrange indicator for channel A |
OVRB | 1 | O | Overrange indicator for channel B |
OVRC | 36 | O | Overrange indicator for channel C |
OVRD | 35 | O | Overrange indicator for channel D |
PDN | 33 | I | Power-down control. This pin has an internal 150-kΩ pull-down resistor. |
RESET | 21 | I | Hardware reset; active high. This pin has an internal 150-kΩ, pull-down resistor. |
SCLK | 13 | I | Serial interface clock input. This pin has an internal 150-kΩ pull-down resistor. |
SDATA | 14 | I | Serial interface data input. This pin has an internal 150-kΩ pull-down resistor. |
SDOUT | 16 | O | Serial interface data output |
SEN | 15 | I | Serial interface enable. Active low. This pin has an internal 150-kΩ pull-up resistor to AVDD. |
SYNCM~ | 42 | I | Negative JESD204B synch input |
SYNCP~ | 43 | I | Positive JESD204B synch input |
SYSREFM | 23 | I | Negative external SYSREF input |
SYSREFP | 22 | I | Positive external SYSREF input |
VCM | 24 | O | Common-mode voltage output for the analog inputs |