ADS9120は、16ビット、2.5MSPSで拡張パフォーマンス機能を搭載した、逐次比較型レジスタ(SAR)アナログ/デジタル・コンバータ(ADC)です。スループットが高いため、開発者は入力信号をオーバーサンプリングし、測定のダイナミックレンジと精度を上げることができます。ADS9110は、ADS9120とピン互換で18ビット、2MSPSのバリエーションです。
ADS9120を使用すると、アナログ性能の向上とともに、TIの拡張SPI機能を使用して高分解能のデータ転送を維持できます。ADS9120は、拡張SPIにより低いクロック速度で高いスループットを達成できるため、基板のレイアウトを簡素化し、システムのコストを低減できます。
また、拡張SPIによりデータのホスト・クロックインが簡素化されるため、このデバイスはFPGAやDSPに関係するアプリケーションに理想的です。ADS9120は、標準SPIインターフェイスと互換性があります。ADS9120には内部的なデータ・パリティ機能があり、ADCデータ出力にパリティを追加できます。パリティ・ビットを使用してホストでADCデータを検証することにより、システムの信頼性が向上します。
このデバイスはJESD8-7A準拠のI/Oをサポートし、拡張産業用温度範囲で動作し、省スペースの4mm×4mmのVQFNパッケージで供給されます。
型番 | 3線式SPI | 3線式拡張SPI |
---|---|---|
ADS9120 | 200MHz | 45MHz |
PIN | FUNCTION | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
AINM | 10 | Analog input | Negative analog input |
AINP | 9 | Analog input | Positive analog input |
AVDD | 13, 14 | Power supply | Analog power supply for the device |
CONVST | 1 | Digital input | Conversion start input pin for the device. A CONVST rising edge brings the device from ACQ state to CNV state. |
CS | 24 | Digital input | Chip-select input pin for the device; active low. The device takes control of the data bus when CS is low. The SDO-x pins go to tri-state when CS is high. |
DVDD | 16 | Power supply | Interface supply |
GND | 11, 15 | Power supply | Ground |
NC | 3, 6, 12 | No connection | These pins must be left floating with no external connection |
REFM | 4, 8 | Analog input | Reference ground potential |
REFP | 5, 7 | Analog input | Reference voltage input |
RST | 2 | Digital input | Asynchronous reset input pin for the device. A low pulse on the RST pin resets the device and all register bits return to a default state. |
RVS | 21 | Digital output | Multi-function output pin for the device. With CS held high, RVS reflects the status of the internal ADCST signal. With CS low, the status of RVS depends on the output protocol selection. |
SCLK | 23 | Digital input | Clock input pin for the serial interface. All system-synchronous data transfer protocols are timed with respect to the SCLK signal. |
SDI | 22 | Digital input | Serial data input pin for the device. This pin is used to feed the data or command into the device. |
SDO-0 | 20 | Digital output | Serial communication: data output 0 |
SDO-1 | 19 | Digital output | Serial communication: data output 1 |
SDO-2 | 18 | Digital output | Serial communication: data output 2 |
SDO-3 | 17 | Digital output | Serial communication: data output 3 |
Thermal pad | Supply | Exposed thermal pad; connecting this pin to GND is recommended |
MIN | MAX | UNIT | |
---|---|---|---|
AVDD to GND | –0.3 | 2.1 | V |
DVDD to GND | –0.3 | 2.1 | V |
REFP to REFM | –0.3 | 5.5 | V |
REFM to GND | –0.1 | 0.1 | V |
Analog (AINP, AINM) to GND | –0.3 | REFP + 0.3 | V |
Digital input (RST, CONVST, CS, SCLK, SDI) to GND | –0.3 | DVDD + 0.3 | V |
Digital output (RVS, SDO-0, SDO-1, SDO-2, SDO-3) to GND | –0.3 | DVDD + 0.3 | V |
Operating temperature, TA | –40 | 85 | °C |
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±500 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
AVDD | Analog supply voltage | 1.8 | V | ||
DVDD | Digital supply voltage | 1.8 | V | ||
REFP | Positive reference | 5 | V |
THERMAL METRIC(1) | ADS9120 | UNITS | |
---|---|---|---|
RGE (VQFN) | |||
24 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 31.9 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 29.9 | °C/W |
RθJB | Junction-to-board thermal resistance | 8.9 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.3 | °C/W |
ψJB | Junction-to-board characterization parameter | 8.9 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 2.0 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
ANALOG INPUT | ||||||
FSR | Full-scale input range (AINP – AINM)(1) |
–VREF | VREF | V | ||
VIN | Absolute input voltage (AINP and AINM to REFGND) |
–0.1 | VREF + 0.1 | V | ||
VCM | Common-mode voltage range (AINP + AINM) / 2 |
(VREF / 2) – 0.1 | VREF / 2 | (VREF / 2) + 0.1 | V | |
CIN | Input capacitance | In sample mode | 60 | pF | ||
In hold mode | 4 | |||||
IIL | Input leakage current | ±1 | µA | |||
VOLTAGE REFERENCE INPUT | ||||||
VREF | Reference input voltage range | 2.5 | 5 | V | ||
IREF | Reference input current | Average current, VREF = 5 V, 2-kHz, full-scale input, throughput = 2.5 MSPS |
1.3 | mA | ||
DC ACCURACY | ||||||
Resolution | 16 | Bits | ||||
NMC | No missing codes | 16 | Bits | |||
INL | Integral nonlinearity | TA = –40°C to +85°C | –0.6 | ±0.25(2) | 0.6 | LSB(3) |
TA = –40°C to +125°C | –0.7 | ±0.25(2) | 0.7 | |||
DNL | Differential nonlinearity | TA = –40°C to +85°C | –0.6 | ±0.25(2) | 0.6 | LSB |
TA = –40°C to +125°C | –0.7 | ±0.25 | 0.7 | |||
E(IO) | Input offset error | –1 | ±0.025(2) | 1 | mV | |
dVOS/dT | Input offset thermal drift | 1 | μV/°C | |||
GE | Gain error | –0.02 | ±0.01(2) | 0.02 | %FS | |
GE/dT | Gain error thermal drift | 0.25 | ppm/°C | |||
Transition noise | 0.35 | LSB | ||||
CMRR | Common-mode rejection ratio | At dc to 20 kHz | 80 | dB | ||
AC ACCURACY(4) | ||||||
SINAD | Signal-to-noise + distortion | fIN = 2 kHz | 94.4 | 96 | dB | |
fIN = 100 kHz | 95 | |||||
fIN = 500 kHz | 83.9 | |||||
SNR | Signal-to-noise ratio | fIN = 2 kHz | 94.5 | 96 | dB | |
fIN = 100 kHz | 95.9 | |||||
fIN = 500 kHz | 84 | |||||
THD | Total harmonic distortion(5) | fIN = 2 kHz | –118 | dB | ||
fIN = 100 kHz | –102 | |||||
fIN = 500 kHz | –101 | |||||
SFDR | Spurious-free dynamic range | fIN = 2 kHz | 120 | dB | ||
fIN = 100 kHz | 108 | |||||
fIN = 500 kHz | 106 | |||||
DIGITAL INPUTS(6) | ||||||
VIH | High-level input voltage | 0.65 DVDD | DVDD + 0.3 | V | ||
VIL | Low-level input voltage | –0.3 | 0.35 DVDD | V | ||
DIGITAL OUTPUTS(6) | ||||||
VOH | High-level output voltage | IOH = 2-mA source | DVDD – 0.45 | V | ||
VOL | Low-level output voltage | IOH = 2-mA sink | 0.45 | V | ||
POWER SUPPLY | ||||||
AVDD | Analog supply voltage | 1.65 | 1.8 | 1.95 | V | |
DVDD | Digital supply voltage | 1.65 | 1.8 | 1.95 | V | |
IDD | AVDD supply current (AVDD = 1.8 V) |
Active, 2.5-MSPS throughput, TA = –40°C to +85°C |
5 | 6.5 | mA | |
Active, 2.5-MSPS throughput, TA = –40°C to +125°C |
5 | 6.75 | ||||
Static, ACQ state | 3.7 | mA | ||||
Low-power, NAP mode | 500 | µA | ||||
Power-down, PD state | 1 | |||||
PD | AVDD power dissipation (AVDD = 1.8 V) |
Active, 2.5-MSPS throughput, TA = –40°C to +85°C |
9 | 11.7 | mW | |
Active, 2.5-MSPS throughput, TA = –40°C to +125°C |
9 | 12.15 | ||||
Static, ACQ state | 6.6 | mW | ||||
Low-power, NAP mode | 900 | µW | ||||
Power-down, PD state | 1.8 | |||||
TEMPERATURE RANGE | ||||||
TA | Operating free-air temperature | –40 | 125 | °C |
MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|
TIMING REQUIREMENTS | |||||
fcycle | Sampling frequency | 2.5 | MHz | ||
tcycle | ADC cycle time period | 400 | ns | ||
twh_CONVST | Pulse duration: CONVST high | 30 | ns | ||
twl_CONVST | Pulse duration: CONVST low | 30 | ns | ||
tacq | Acquisition time | 100 | ns | ||
tqt_acq | Quiet acquisition time(1) | 25 | ns | ||
td_cnvcap | Quiet aperture time(1) | 10 | ns | ||
TIMING SPECIFICATIONS | |||||
tconv | Conversion time | 270 | 290 | ns |
MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|
TIMING REQUIREMENTS | |||||
twl_RST | Pulse duration: RST low | 100 | ns | ||
TIMING SPECIFICATIONS | |||||
td_rst | Delay time: RST rising to RVS rising | 1250 | µs | ||
tnap_wkup | Wake-up time: NAP mode | 300 | ns | ||
tPWRUP | Power-up time: PD mode | 250 | µs |
MIN | TYP | MAX | UNIT | |||
---|---|---|---|---|---|---|
TIMING REQUIREMENTS | ||||||
fCLK | Serial clock frequency | 75 | MHz | |||
tCLK | Serial clock time period | 13.33 | ns | |||
tph_CK | SCLK high time | 0.45 | 0.55 | tCLK | ||
tpl_CK | SCLK low time | 0.45 | 0.55 | tCLK | ||
tsu_CSCK | Setup time: CS falling to the first SCLK capture edge | 5 | ns | |||
tsu_CKDI | Setup time: SDI data valid to the SCLK capture edge | 1.2 | ns | |||
tht_CKDI | Hold time: SCLK capture edge to (previous) data valid on SDI | 0.65 | ns | |||
tht_CKCS | Delay time: last SCLK falling to CS rising | 5 | ns | |||
TIMING SPECIFICATIONS | ||||||
tden_CSDO | Delay time: CS falling to data enable | 4.5 | ns | |||
tdz_CSDO | Delay time: CS rising to SDO going to 3-state | 10 | ns | |||
td_CKDO | Delay time: SCLK launch edge to (next) data valid on SDO | 6.5 | ns | |||
td_CSRDY_f | Delay time: CS falling to RVS falling | 5 | ns | |||
td_CSRDY_r | Delay time: CS rising to RVS rising |
After NOP operation | 10 | ns | ||
After WR or RD operation | 70 |
MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|
TIMING REQUIREMENTS | |||||
fCLK | Serial clock frequency | 100 | MHz | ||
tCLK | Serial clock time period | 10 | ns | ||
TIMING SPECIFICATIONS(1) | |||||
td_CKSTR_r | Delay time: SCLK launch edge to RVS rising | 8.5 | ns | ||
td_CKSTR_f | Delay time: SCLK launch edge to RVS falling | 8.5 | ns | ||
toff_STRDO_f | Time offset: RVS rising to (next) data valid on SDO | –0.5 | 0.5 | ns | |
toff_STRDO_r | Time offset: RVS falling to (next) data valid on SDO | –0.5 | 0.5 | ns |
MIN | TYP | MAX | UNIT | |||
---|---|---|---|---|---|---|
TIMING SPECIFICATIONS(1) | ||||||
td_CSSTR | Delay time: CS falling to RVS rising | 12 | 40 | ns | ||
toff_STRDO_f | Time offset: RVS rising to (next) data valid on SDO | –0.5 | 0.5 | ns | ||
toff_STRDO_r | Time offset: RVS falling to (next) data valid on SDO | –0.5 | 0.5 | ns | ||
tSTR | Strobe output time period | INTCLK option | 9.9 | 11.1 | ns | |
INTCLK / 2 option | 19.8 | 22.2 | ||||
INTCLK / 4 option | 39.6 | 44.4 | ||||
tph_STR | Strobe output high time | 0.45 | 0.55 | tSTR | ||
tpl_STR | Strobe output low time | 0.45 | 0.55 | tSTR |
Typical INL = ±0.25 LSB |
120 devices |
VREF = 5 V |
TA = 25°C |
Standard deviation = 0.35 LSB |
fIN = 2 kHz, SNR = 96 dB, THD = –118 dB |
fIN = 2 kHz, VREF = 5 V |
fIN = 2 kHz, TA = 25°C |
VREF = 5 V, TA = 25°C |
3500 devices |
VREF = 5 V |
TA = 25°C |
2.5 MSPS |
2.5 MSPS |
Typical DNL = ±0.25 LSB |
120 devices |
VREF = 5 V |
TA = 25°C |
Standard deviation = 0.35 LSB |
fIN = 100 kHz, SNR = 95.9 dB, THD = –102 dB |
fIN = 2 kHz, VREF = 5 V |
fIN = 2 kHz, TA = 25°C |
VREF = 5 V, TA = 25°C |
3500 devices |
VREF = 5 V |
TA = 25°C |
TA = 25°C |
TA = 25°C |