Analog Devices: Now choosing a SAR ADC without compromising accuracy, speed, or cost is as simple as choosing Analog Devices. :: オーバービュ :: A/Dコンバータ

Now choosing a SAR ADC without compromising accuracy, speed, or cost is as simple as choosing Analog Devices.

Analog Devices' family of PulSAR® Analog-to-Digital Converters represents the industry's leading and best performing 14-bit, 16-bit, and 18-bit SAR ADCs available today.

Just introduced...the AD761x and AD763x PulSAR® families feature the industry's first high voltage (±5V and ±10V), 16-bit and 18-bit precision ADCs with software selectable unipolar and bipolar input ranges.

Using Analog Devices' patented iCMOS™ process technology, these new PulSAR products join the growing iCMOS product portfolio.

For a complete overview of the PulSAR Product Family, see the Selection Table below. Need an Op Amp or Voltage Reference to accompany your SAR ADC, recommendations are made below.

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Industry Firsts
	Highest resolution – 18 bits at 2 MSPS (AD7641)
	Highest accuracy – 1 LSB at 1 MSPS (AD7677)
	Smallest package – 3 mm x 3 mm QFN (AD7690)

Features

Low Power: 1.35mW @ 2.5V operation (AD7685)
Input Range: Unipolar

True differential

Both serial and parallel interfaces on the same
ADC

-	SPI®/QSPI™/MICROWIRE™/DSP

Internal conversion clock in most models

Applications
	High speed data acquisition
	Process control and industrial equipment
	CT scanners
	MRI equipment
	Test and measurement systems
	Optical networking equipment
	Battery-operated systems
	Network analyzers
	Motor control
	Scanners

Part #	Res (Bits)	T-Put Rate	INL (ppm)	Res for NMC (Bits)	SNR (dB)	# of ADC Inputs	Analog Input Type	Ext Ref	Int Ref	Supply V	Pwr Diss (max)	Interface	Pkg Type
AD7641	18	2MSPS	11.25	18	93.5	1	Diff-Uni	Yes	Yes	Single(+2.5)	100mW	Par, Ser, SPI	CSP, QFP
AD7643	18	1.25MSPS	11.25	18	93.5	1	Diff-Uni	Yes	Yes	Single(+2.5)	60mW	Par, Ser, SPI	CSP, QFP
AD7674	18	800kSPS	10	18	101	1	Diff-Uni	Yes	No	Single(+5)	90mW	Par, Ser, SPI	CSP, QFP
AD7634	18	670kSPS	10	18	101	1	Diff-Uni/Bip	Yes	Yes	Multi(+5,±15)	165mW	Par, Ser, SPI	CSP, QFP
AD7679	18	570kSPS	10	18	101	1	Diff-Uni	Yes	No	Single(+5)	90mW	Par, Ser, SPI	CSP, QFP
AD7690	18	400kSPS	10	18	102	1	Diff-Uni	Yes	No	Single(+5)	20mW	Ser, SPI	CSP, MSOP
AD7631	18	250kSPS	10	18	101	1	Diff-Uni/Bip	Yes	Yes	Multi(+5,±15)	100mW	Par, Ser, SPI	CSP, QFP
AD7691	18	250kSPS	10	18	101	1	Diff-Uni	Yes	No	Single(+5)	20mW	Ser, SPI	CSP, MSOP
AD7678	18	100kSPS	10	18	101	1	Diff-Uni	Yes	No	Single(+5)	26mW	Par, Ser, SPI	CSP, QFP
AD7621	16	3MSPS	30	16	89.5	1	Diff-Uni	Yes	Yes	Single(+2.5)	86mW	Par, Ser, SPI	CSP, QFP
AD7622	16	2MSPS	23	16	91	1	Diff-Uni	Yes	Yes	Single(+2.5)	85mW	Par, Ser, SPI	CSP, QFP
AD7623	16	1.33MSPS	30	16	89.5	1	Diff-Uni	Yes	Yes	Single(+2.5)	55mW	Par, Ser, SPI	CSP, QFP
AD7655	16	1MSPS	92	15	86	4	SE-Uni	Yes	No	Single(+5)	135mW	Par, Ser, SPI	CSP, QFP
AD7653	16	1MSPS	92	15	86	1	SE-Uni	Yes	Yes	Single(+5)	145mW	Par, Ser, SPI	CSP, QFP
AD7667	16	1MSPS	31	16	89.2	1	SE-Uni	Yes	Yes	Single(+5)	145mW	Par, Ser, SPI	CSP, QFP
AD7671	16	1MSPS	38	16	90	1	SE-Uni/Bip	Yes	No	Single(+5)	125mW	Par, Ser, SPI	CSP, QFP
AD7677	16	1MSPS	15	16	94	1	Diff-Uni	Yes	No	Single(+5)	130mW	Par, Ser, SPI	CSP, QFP
AD7612	16	750kSPS	30	16	93	1	SE-Uni/Bip	Yes	Yes	Multi(+5,±15)	165mW	Par, Ser, SPI	CSP, QFP
AD7650	16	570kSPS	92	15	86	1	SE-Uni	Yes	No	Single(+5)	115mW	Par, Ser, SPI	CSP, QFP
AD7664	16	570kSPS	38	16	90	1	SE-Uni	Yes	No	Single(+5)	115mW	Par, Ser, SPI	CSP, QFP
AD7665	16	570kSPS	38	16	90	1	SE-Uni/Bip	Yes	No	Single(+5)	107mW	Par, Ser, SPI	CSP, QFP
AD7652	16	500kSPS	92	15	86	1	SE-Uni	Yes	Yes	Single(+5)	90mW	Par, Ser, SPI	CSP, QFP
AD7654	16	500kSPS	53	16	90	4	SE-Uni	Yes	No	Single(+5)	135mW	Par, Ser, SPI	CSP, QFP
AD7666	16	500kSPS	31	16	89.2	1	SE-Uni	Yes	Yes	Single(+5)	90mW	Par, Ser, SPI	CSP, QFP
AD7676	16	500kSPS	15	16	94	1	Diff-Uni	Yes	No	Single(+5)	74mW	Par, Ser, SPI	CSP, QFP
AD7980	16	1MSPS	30.5	16	91.5	1	SE-Uni	Yes	No	Single(+5)	9mW	Ser, SPI	CSP, MSOP
AD7686	16	500kSPS	30	16	92.7	1	SE-Uni	Yes	No	Single(+5)	22mW	Ser, SPI	CSP, MSOP
AD7688	16	500kSPS	23	16	96.5	1	Diff-Uni	Yes	No	Single(+5)	30mW	Ser, SPI	CSP, MSOP
AD7693	16	500kSPS	10	16	96	1	Diff-Uni	Yes	No	Single(+5)	25mW	Ser, SPI	CSP, MSOP
AD7610	16	250kSPS	30	16	93	1	SE-Uni/Bip	Yes	Yes	Multi(+5,±15)	75mW	Ser, Par	QFP, CSP
AD7694	16	250kSPS	61	16	92	1	SE-Uni	Yes	No	Single(+5)	6mW	Ser, SPI	SOP
AD7663	16	250kSPS	46	16	90	1	SE-Uni/Bip	Yes	No	Single(+5)	41mW	Par, Ser, SPI	CSP, QFP
AD7685	16	250kSPS	31	16	93.5	1	SE-Uni	Yes	No	Single(+5)	15mW	Ser, SPI	CSP, MSOP
AD7687	16	250kSPS	23	16	96.5	1	Diff-Uni	Yes	No	Single(+5)	12.5mW	Ser, SPI	CSP, MSOP
AD974	16	200kSPS	30	16	85	4	SE-Bip, SE-Uni	Yes	Yes	Single(+5)	120mW	Ser, SPI	DIP, SOIC, SOP
AD976A	16	200kSPS	31	16	85	1	SE-Bip, SE-Uni	Yes	Yes	Single(+5)	100mW	Par	DIP, SOIC, SOP
AD977A	16	200kSPS	31	16	85	1	SE-Bip, SE-Uni	Yes	Yes	Single(+5)	100mW	Ser	DIP, SOIC, SOP
AD676	16	100kSPS	22.9	16	n/a	1	SE-Bip	Yes	Yes	Multi (±12, +5)	480mW	Par	DIP
AD677	16	100kSPS	22.9	16	n/a	1	SE-Bip	Yes	Yes	Multi (±12, +5)	630mW	Ser	DIP, SOIC
AD7651	16	100kSPS	92	15	86	1	SE-Uni	Yes	Yes	Single(+5)	45mW	Par, Ser, SPI	CSP, QFP
AD7660	16	100kSPS	46	16	90	1	SE-Uni	Yes	Yes	Single(+5)	25mW	Par, Ser, SPI	CSP, QFP
AD7661	16	100kSPS	38	16	89.3	1	SE-Uni	Yes	Yes	Single(+5)	45mW	Par, Ser, SPI	CSP, QFP
AD7675	16	100kSPS	23	16	94	1	Diff-Uni	Yes	No	Single(+5)	25mW	Par, Ser, SPI	CSP, QFP
AD7680	16	100kSPS	61	15	86	1	SE-Uni	Yes	No	Single(+3) Single(+3.3) Single(+5)	n/a	Ser, SPI	SOP, SOT
AD7683	16	100kSPS	46	16	86	1	SE-Uni	Yes	No	Single(+5)	6mW	Ser, SPI	CSP, MSOP
AD7684	16	100kSPS	46	16	86	1	Diff-Uni	Yes	No	Single(+5)	6mW	Ser, SPI	MSOP
AD976	16	100kSPS	31	16	85	1	SE-Bip	Yes	Yes	Single(+5)	100mW	Par	DIP, SOIC, SOP
AD977	16	100kSPS	31	16	85	1	SE-Bip, SE-Uni	Yes	Yes	Single(+5)	100mW	Ser	DIP, SOIC, SOP
AD7946	14	500kSPS	61	14	85	1	SE-Uni	Yes	No	Single(+5)	19mW	Ser, SPI	CSP, MSOP
AD7942	14	250kSPS	61	14	85	1	SE-Uni	Yes	No	Single(+5)	12.5mW	Ser, SPI	CSP, MSOP

Take advantage of the industry's highest performing SAR ADCs using these recommended op amps and voltage references.

Operational Amplifiers

The AD8021 offers high speed with extraordinary precision. It's a voltage feedback amplifier that can be configured to achieve 200 MHz bandwidth with gains from 1 to 10. It also features ultralow noise at just 2.1 nV/√Hz, low distortion, and low power.

Other op amps recommended for design with ADI's PulSAR converters are:

	AD8610: Precision, low input bias current, wide bandwidth, JFET op amp
	AD8027: Low distortion, high speed, rail-to-rail input/output amplifier
	AD8031: High frequency, low power
	AD829: High speed, low noise video op amp
	AD8519: 8 MHz rail-to-rail op amp
	AD8515: Low noise, rail-to-rail op amp
	OP162: 15 MHz rail-to-rail op amp
	OP184: Single-supply, rail-to-rail input/output op amp

Voltage References

The ADR431 is a low noise, 2.5 V precision voltage reference that provides the lowest noise level achievable for 5 V systems. It is based on ADI's XFET® technology, designed specifically to exhibit low noise and extremely flat temperature drift performance, as well as to solve many of the inherent problems that limit the use of band gap and buried Zener references in high precision and digitally controlled applications. The ADR431 operates over a wide range of 4 V to 18 V.

Other voltage references recommended for design with ADI's PulSAR are:

	ADR433: 3 V precision XFET voltage reference
	AD780: 2.5 V/3.0 V precision band gap voltage reference