| Gain TC | 2 ppm FSR/°C typ, 5 ppm FSR/°C max |
| Function | +3.3 V/+5 V Multiplying 12-Bit DAC with 8-bit byte interface |
| Pin count | 20 pins |
ЦАП AD7948BNZ представляет собой 12‑разрядный токовый multiplying‑ЦАП с 8‑битным байтовым интерфейсом.
Устройство работает в нормальном режиме от однополярного источника +5 V.
Поддерживается также biased‑режим с питанием от +3 V до +5.5 V и смещением выходного каскада.
Архитектура с сегментированным R‑2R лестничным ЦАП обеспечивает относительную точность до 0.5 LSB и монотонность по всему диапазону.
Низкое энергопотребление и быстрый интерфейс WR делают микросхему пригодной для встраиваемых и батарейных систем.
Доступны различные варианты корпусов, включая 20‑выводной пластмассовый DIP.
| Gain TC | 2 ppm FSR/°C typ, 5 ppm FSR/°C max |
| Function | +3.3 V/+5 V Multiplying 12-Bit DAC with 8-bit byte interface |
| Pin count | 20 pins |
| Gain error | ±2 LSB max (B grade, normal mode, TMIN to TMAX) |
| Resolution | 12 bit |
| Part number | AD7948BNZ |
| Architecture | Current-output segmented R-2R ladder DAC |
| Manufacturer | Analog Devices, Inc. |
| DAC output type | Current output (IOUT1) |
| ESD sensitivity | ESD sensitive device, proprietary protection; handling precautions required |
| Input logic family | CMOS/TTL compatible |
| Reference input type | Multiplying, VREF pin, ac or dc within absolute maximum ratings |
| Typical applications | Battery-powered instrumentation, laptop computers, 5 V DAC upgrades |
| Digital interface type | 8-bit byte parallel interface (DB7–DB0, CSMSB, CSLSB, WR, LDAC, CTRL, DF/DOR) |
| Package type AD7948BNZ | 20-lead Plastic DIP N-20, RoHS (Z suffix) |
| INL (Relative Accuracy) | ±0.5 LSB max (B grade, normal mode) |
| Storage temperature range | -65°C to +150°C |
| Total harmonic distortion | -83 dB typ |
| Digital input current IINH | ±1 µA max |
| Junction temperature (max) | +150°C |
| Reference input resistance | 6 kΩ min, 12 kΩ max (typ 9 kΩ) |
| Bipolar output mode support | Yes, four-quadrant multiplication (Figure 15) |
| Settling time (biased mode) | 5 µs typ to 0.01% FSR (VREF = 0 V, full-scale step) |
| Settling time (normal mode) | 600 ns typ to 0.01% FSR (VREF = +10 V, full-scale step) |
| Output leakage current IOUT1 | 10 nA max @ +25°C, 100 nA max over TMIN to TMAX |
| Unipolar output mode support | Yes, two-quadrant multiplication (Figure 14) |
| VDD to DGND absolute maximum | -0.3 V to +6 V |
| AGND to DGND absolute maximum | -0.3 V to VDD + 0.3 V |
| Digital input capacitance CIN | 10 pF max |
| Multiplying feedthrough error | -75 dB max |
| Linearity error AD7948BN grade | ±0.5 LSB (B grade) |
| VINH @ VDD = 5 V (normal mode) | 2.4 V min |
| VINL @ VDD = 5 V (normal mode) | 0.8 V max |
| DNL (Differential Nonlinearity) | ±0.5 LSB max (B grade, normal mode), guaranteed monotonic |
| Nominal supply voltage AD7948BN | +5 V |
| VINH @ VDD = 3.3 V (biased mode) | 2.1 V min |
| VINL @ VDD = 3.3 V (biased mode) | 0.6 V max |
| Single-supply biased mode support | Yes, with 1.23 V bias at AGND/IOUT2 ("-B" versions) |
| Supply voltage range (normal mode) | 4.5 V to 5.5 V |
| VREF, RFB to DGND absolute maximum | ±15 V |
| Power dissipation DIP package limit | 670 mW (absolute maximum) |
| Package thermal impedance θJA (DIP) | 116°C/W |
| Digital output VOH (SRO, AD7943 only) | VDD – 0.2 V min |
| Digital output VOL (SRO, AD7943 only) | 0.2 V max (for 1 CMOS load) |
| IOUT1, IOUT2 to DGND absolute maximum | -0.3 V to VDD + 0.3 V |
| Power supply sensitivity ∆Gain/∆VDD | -75 dB typ |
| Output noise spectral density (biased mode) | 25 nV/√Hz typ @ 1 kHz |
| Output noise spectral density (normal mode) | 35 nV/√Hz typ @ 1 kHz |
| Operating temperature range (AD7948BN grade) | -40°C to +85°C |
| Output capacitance (all 0s code, normal mode) | 30 pF max |
| Output capacitance (all 1s code, normal mode) | 60 pF max |
| Digital input voltage to DGND absolute maximum | -0.3 V to VDD + 0.3 V |
| Digital-to-analog glitch impulse (biased mode) | 60 nV-s typ (VREF = 1.23 V, full-scale code toggle) |
| Digital-to-analog glitch impulse (normal mode) | 60 nV-s typ (VREF = 0 V, full-scale code toggle) |
| Supply current IDD (AD7948, static CMOS levels) | 5 µA max, typically 1 µA |
| Supply voltage range (biased mode "-B" versions) | 3.0 V to 5.5 V |
| Timing tDS (data setup time, VDD = 3 V to 3.6 V) | 45 ns min |
| Timing tDH (data hold time, VDD = 4.5 V to 5.5 V) | 10 ns min |
| Timing tWR (write pulsewidth, VDD = 3 V to 3.6 V) | 60 ns min |
| Maximum input current to any pin (except supplies) | ±10 mA (transient up to 100 mA without latch-up) |
| Timing tDS (data setup time, VDD = 4.5 V to 5.5 V) | 30 ns min |
| Timing tWR (write pulsewidth, VDD = 4.5 V to 5.5 V) | 40 ns min |
| Supply current IDD (AD7948, switching inputs 0.8 V / 2.4 V) | Typically 2.5 mA |
Предлагаем ЦАП Analog Devices AD7948BNZ, 12-разрядный, multiplying, 8-bit byte interface на выгодных условиях с полной технической поддержкой. Проверим наличие, поможем подобрать аналог.
Получить коммерческое предложение или оформить заказ:
8 800 301-96-04 info@fregat.ru
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