Texas Instruments THS5661AIPWR, THS5661AIPW, THS5661AIDWR, THS5661AIDW Datasheet

THS5661A 12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

DMember of the Pin-Compatible CommsDAC Product Family

D125 MSPS Update Rate

D12-Bit Resolution

DSpurious Free Dynamic Range (SFDR) to Nyquist at 40 MHz Output: 60 dBc

D1 ns Setup/Hold Time

DDifferential Scalable Current Outputs: 2 mA to 20 mA

DOn-Chip 1.2 V Reference

D3 V and 5 V CMOS-Compatible Digital Interface

DStraight Binary or Twos Complement Input

DPower Dissipation: 175 mW at 5 V, Sleep Mode: 25 mW at 5 V

SOIC (DW) OR TSSOP (PW) PACKAGE

(TOP VIEW)

D11			1	28			CLK
D10			2	27			DVDD
D9			3	26			DGND
D8			4	25			MODE
D7			5	24			AVDD
D6			6	23			COMP2
D5			7	22			IOUT1
D4			8	21			IOUT2
D3			9	20			AGND
D2			10	19			COMP1
D1			11	18			BIASJ
D0			12	17			EXTIO
NC			13	16			EXTLO
NC			14	15			SLEEP

D Package: 28-Pin SOIC and TSSOP	NC ± No internal connection

description

The THS5661A is a 12-bit resolution digital-to-analog converter (DAC) specifically optimized for digital data transmission in wired and wireless communication systems. The 12-bit DAC is a member of the CommsDAC series of high-speed, low-power CMOS digital-to-analog converters. The CommsDAC family consists of pin compatible 14-, 12-, 10-, and 8-bit DACs. All devices offer identical interface options, small outline package, and pinout. The THS5661A offers superior ac and dc performance while supporting update rates up to 125 MSPS.

The THS5661A operates from an analog supply of 4.5 V to 5.5 V. Its inherent low power dissipation of 175 mW ensures that the device is well-suited for portable and low-power applications. Lowering the full-scale current output reduces the power dissipation without significantly degrading performance. The device features a SLEEP mode, which reduces the standby power to approximately 25 mW, thereby optimizing the power consumption for system needs.

The THS5661A is manufactured in Texas Instruments advanced high-speed mixed-signal CMOS process. A current-source-array architecture combined with simultaneous switching shows excellent dynamic performance. On-chip edge-triggered input latches and a 1.2 V temperature-compensated bandgap reference provide a complete monolithic DAC solution. The digital supply range of 3 V to 5.5 V supports 3 V and 5 V CMOS logic families. Minimum data input setup and hold times allow for easy interfacing with external logic. The THS5661A supports both a straight binary and twos complement input word format, enabling flexible interfacing with digital signal processors.

The THS5661A provides a nominal full-scale differential output current of 20 mA and >300 kΩ output impedance, supporting both single-ended and differential applications. The output current can be directly fed to the load (e.g., external resistor load or transformer), with no additional external output buffer required. An accurate on-chip reference and control amplifier allows the user to adjust this output current from 20 mA down to 2 mA, with no significant degradation of performance. This reduces power consumption and provides 20 dB gain range control capabilities. Alternatively, an external reference voltage and control amplifier may be applied in applications using a multiplying DAC. The output voltage compliance range is 1.25 V.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

CommsDAC is a trademark of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright 1999, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

THS5661A

12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

description (continued)

The THS5661A is available in both a 28-pin SOIC and TSSOP package. The device is characterized for operation over the industrial temperature range of ±40°C to 85°C.

AVAILABLE OPTIONS

	PACKAGE
TA
	28-TSSOP	28-SOIC
	(PW)	(DW)
± 40°C to 85°C	THS5661AIPW	THS5661AIDW

functional block diagram

			C1	AVDD
	SLEEP	COMP1	0.1 µF	COMP2	0.1 µF
EXTLO	1.2 V
	REF

		1 nF			IOUT1
EXTIO	±			Output	50 Ω	RLOAD
CEXT			Current
			Source	Current
BIASJ	+	Control	Array	Switches
0.1 µF		AMP
I BIAS					IOUT2
2 kΩ RBIAS
DVDD					50 Ω	RLOAD

Logic

D[11:0]

Control

MODE

CLK

DGND

AGND

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

			THS5661A
			12-BIT, 125 MSPS, CommsDAC
			DIGITAL-TO-ANALOG CONVERTER
			SLAS247 ± NOVEMBER 1999
			Terminal Functions
TERMINAL		I/O	DESCRIPTION
NAME	NO.
AGND	20	I	Analog ground return for the internal analog circuitry
AVDD	24	I	Positive analog supply voltage (4.5 V to 5.5 V)
BIASJ	18	O	Full-scale output current bias
CLK	28	I	External clock input. Input data latched on rising edge of the clock.
COMP1	19	I	Compensation and decoupling node, requires a 0.1 F capacitor to AVDD.
COMP2	23	I	Internal bias node, requires a 0.1 F decoupling capacitor to AGND.
D[11:0]	[1:12]	I	Data bits 0 through 11.
			D11 is most significant data bit (MSB), D0 is least significant data bit (LSB).
DGND	26	I	Digital ground return for the internal digital logic circuitry
DVDD	27	I	Positive digital supply voltage (3 V to 5.5 V)
EXTIO	17	I/O	Used as external reference input when internal reference is disabled (i.e., EXTLO = AVDD). Used as internal
			reference output when EXTLO = AGND, requires a 0.1 F decoupling capacitor to AGND when used as reference
			output.
EXTLO	16	O	Internal reference ground. Connect to AVDD to disable the internal reference source.
IOUT1	22	O	DAC current output. Full scale when all input bits are set 1
IOUT2	21	O	Complementary DAC current output. Full scale when all input bits are 0
MODE	25	I	Mode select. Internal pulldown. Mode 0 is selected if this pin is left floating or connected to DGND. See
			timing diagram.
NC	[13:14]	N	No connection
SLEEP	15	I	Asynchronous hardware power down input. Active high. Internal pulldown. Requires 5 s to power down but 3 ms
			to power up.

absolute maximum ratings over operating free-air temperature (unless otherwise noted)²

Supply voltage range, AVDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . ±0.3 V to 6.5 V
DVDD (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . ±0.3 V to 6.5 V
Voltage between AGND and DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . ±0.3 V to 0.5 V
Supply voltage range, AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . ±6.5 V to 6.5 V
CLK, SLEEP, MODE (see Note 2) . . . . . . . . . . . . . . . . . . . . . .	±0.3 V to DVDD + 0.3 V
Digital input D11±D0 (see Note 2) . . . . . . . . . . . . . . . . . . . . .	±0.3 V to DVDD + 0.3 V
IOUT1, IOUT2 (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. ±1 V to AVDD + 0.3 V
COMP1, COMP2 (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . .	±0.3 V to AVDD + 0.3 V
EXTIO, BIASJ (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . .	±0.3 V to AVDD + 0.3 V
EXTLO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . ±0.3 V to 0.3 V
Peak input current (any input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . 20 mA
Peak total input current (all inputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . ±30 mA
Operating free-air temperature range, TA: THS5661AI . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . ±40°C to 85°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . ±65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from the case for 10 seconds . . . . . . . . . . . . . .	. . . . . . . . . . . . . . 260°C

² Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. Measured with respect to AGND. 2. Measured with respect to DGND.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

THS5661A

12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, AVDD = 5 V, DVDD = 5 V, IOUTFS = 20 mA (unless otherwise noted)

dc specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Resolution

12

Bits

DC accuracy²

INL

Integral nonlinearity

TA = ±40°C to 85°C

±4

±0.75

4

LSB

DNL

Differential nonlinearity

±2

±0.5

2

LSB

Monotonicity

At 11-bit level

Monotonic

Analog output

Offset error

0.02

%FSR

Gain error

Without internal reference

2.3

%FSR

With internal reference

1.3

Full scale output current³

2

20

mA

Output compliance range

AVDD = 5 V,

IOUTFS = 20 mA

±1

1.25

V

Output resistance

300

kΩ

Output capacitance

5

pF

Reference output

Reference voltage

1.18

1.22

1.32

V

Reference output current§

100

nA

Reference input

VEXTIO

Input voltage range

0.1

1.25

V

Input resistance

1

MΩ

Small signal bandwidth¶

Without CCOMP1

1.3

MHz

Input capacitance

100

pF

Temperature coefficients

Offset drift

0

Gain drift

Without internal reference

±40

ppm of

With internal reference

±120

FSR/°C

Reference voltage drift

±35

Power supply

AVDD

Analog supply voltage

4.5

5

5.5

V

DVDD

Digital supply voltage

3

5.5

V

IAVDD

Analog supply current

25

30

mA

Sleep mode supply current

Sleep mode

3

5

mA

I

Digital supply current#

5

6

mA

DVDD

Power dissipation||

AVDD = 5 V,

DVDD = 5 V, IOUTFS = 20 mA

175

mW

AVDD

Power supply rejection ratio

±0.4

%FSR/V

DVDD

±0.025

Operating range

±40

85

°C

² Measured at IOUT1 in virtual ground configuration.

³ Nominal full-scale current IOUTFS equals 32X the IBIAS current.

§ Use an external buffer amplifier with high impedance input to drive any external load.

¶ Reference bandwidth is a function of external cap at COMP1 pin and signal level.

# Measured at f

CLK

= 50 MSPS and f

= 1 MHz.

OUT

|| Measured for 50

Ω R

LOAD

at IOUT1 and IOUT2, f

CLK

= 50 MSPS and f

= 20 MHz.

OUT

Specifications subject to change

4	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

THS5661A 12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, AVDD = 5 V, DVDD = 5 V, IOUTFS = 20 mA, differential transformer coupled output, 50 Ω doubly terminated load

(unless otherwise noted)

ac specifications

	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
Analog output
fCLK	Maximum output update rate	DVDD = 4.5 V to 5.5 V	100	125		MSPS
		DVDD = 3 V to 3.6 V	70	100
t	Output settling time to 0.1%²			35		ns
s(DAC)
tpd	Output propagation delay			1		ns
GE	Glitch energy³	Worst case LSB transition (code 2047 ± code 2048)		5		pV-s
t	Output rise time 10% to 90%²			1		ns
r(IOUT)
t	Output fall time 90% to 10%²			1		ns
f(IOUT)
	Output noise	IOUTFS = 20 mA		15		pA/√ HZ
		IOUTFS = 2 mA		10
AC linearity
		fCLK = 25 MSPS, fOUT = 1 MHz, TA = 25°C		±78
THD	Total harmonic distortion	fCLK = 50 MSPS, fOUT = 1 MHz, TA = ±40°C to 85°C		±77	±66	dBc
		fCLK = 50 MSPS, fOUT = 2 MHz, TA = 25°C		±75
		fCLK = 100 MSPS, fOUT = 2 MHz, TA = 25°C		±75
		fCLK = 25 MSPS, fOUT = 1 MHz, TA = 25°C		82
		fCLK = 50 MSPS, fOUT= 1 MHz, TA = ±40°C to 85°C	68
		fCLK = 50 MSPS, fOUT = 1 MHz, TA = 25°C		79		dBc
	Spurious free dynamic range to	fCLK = 50 MSPS, fOUT = 2.51 MHz, TA = 25°C		75
		fCLK = 50 MSPS, fOUT = 5.02 MHz, TA = 25°C		69
	Nyquist
SFDR		fCLK = 50 MSPS, fOUT = 20.2 MHz, TA = 25°C		61
		fCLK = 100 MSPS, fOUT = 5.04 MHz, TA = 25°C		68		dBc
		fCLK = 100 MSPS, fOUT = 20.2 MHz, TA = 25°C		59		dBc
		fCLK = 100 MSPS, fOUT = 40.4 MHz, TA = 25°C		60		dBc
	Spurious free dynamic range	fCLK = 50 MSPS, fOUT = 1 MHz, TA= 25°C,1 MHz span		89
		fCLK = 50 MSPS, fOUT = 5.02 MHz, 2 MHz span		88		dBc
	within a window
		fCLK = 100 MSPS, fOUT= 5.04 MHz, 4 MHz span		89
² Measured single ended into 50 Ω load at IOUT1.
³ Single-ended output IOUT1, 50 Ω doubly terminated load.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

5

THS5661A

12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, AVDD = 5 V, DVDD = 5 V, IOUTFS = 20 mA (unless otherwise noted)

digital specifications

	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
Interface
VIH	High-level input voltage	DVDD = 5 V	3.5	5		V
		DVDD = 3.3 V	2.1	3.3
VIL	Low-level input voltage	DVDD = 5 V		0	1.3	V
		DVDD = 3.3 V		0	0.9
IIH	High-level input current	DVDD = 3 V to 5.5 V	±10		10	A
IIL	Low-level input current	DVDD = 3 V to 5.5 V	±10		10	A
	Input capacitance		1		5	pF
Timing
tsu(D)	Input setup time		1			ns
th(D)	Input hold time		1			ns
tw(LPH)	Input latch pulse high time		4			ns
td(D)	Digital delay time				1	clk

Specifications subject to change

6	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

THS5661A 12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

TYPICAL CHARACTERISTICS²

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 0 dBFS

	90
		fCLK = 5 MSPS			DVDD = 5 V
	84
	78		fCLK = 25 MSPS
± dBc	72		fCLK = 50 MSPS
			fCLK = 70 MSPS
SFDR	66
				fCLK = 100 MSPS
	60
	54			fCLK = 125 MSPS
	48
	0	10	20	30	40	50
		Fout ± Output Frequency ± MHz

Figure 1

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 25 MSPS

	90
											DVDD = 5 V
	84
					0 dBFS
dBc±SFDR	72
	78
			± 12 dBFS										± 6 dBFS
	66
	60
	0		2				4		6		8		10		12

Fout ± Output Frequency ± MHz

Figure 3

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 5 MSPS

90

DVDD = 5 V

84

0 dBFS

±6 dBFS

± dBc	78
SFDR	72	± 12 dBFS
	66
	60
	0	0.5	1.0	1.5	2.0	2.5

Fout ± Output Frequency ± MHz

Figure 2

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 50 MSPS

	78
					DVDD = 5 V
			± 6 dBFS
	72
dBc	66	± 12 dBFS
SFDR ±	60		0 dBFS
	54
	48
	0	5	10	15	20	25
		Fout ± Output Frequency ± MHz

Figure 4

²AV DD = 5 V, IOUTFS = 20 mA, differential transformer coupled output, 50 Ω doubly terminated load, TA = 25°C (unless otherwise noted.)

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

7

THS5661A

12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

TYPICAL CHARACTERISTICS²

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 70 MSPS

78

DVDD = 5 V

± 6 dBFS

	72
dBc	66
SFDR ±	± 12 dBFS
	60

0 dBFS

54

48

0	10	20	30	40
	Fout ± Output Frequency ± MHz

Figure 5

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 125 MSPS

	78				DVDD = 5 V
	72		± 6 dBFS
			± 12 dBFS
± dBc	66
SFDR	60	0 dBFS
	54
	48
	0	10	20	30	40	50
		Fout ± Output Frequency ± MHz

Figure 7

			SPURIOUS FREE DYNAMIC RANGE
									vs
			OUTPUT FREQUENCY AT 100 MSPS
	78
													DVDD = 5 V
	72
				± 6 dBFS
dBc	66										± 12 dBFS
SFDR ±
	60
									0 dBFS
	54
	48
	0		10			20			30				40			50

Fout ± Output Frequency ± MHz

Figure 6

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 0 dBFS

	90			DVDD = 3.3 V
	84	fCLK = 5 MSPS
	78
	72	fCLK = 25 MSPS
dBc
		fCLK = 50 MSPS
±	66		fCLK = 70 MSPS
SFDR
	60
	54
	48	fCLK = 100 MSPS
	42
	0	10	20	30	40
		Fout ± Output Frequency ± MHz

Figure 8

²AV DD = 5 V, IOUTFS = 20 mA, differential transformer coupled output, 50 Ω doubly terminated load, TA = 25°C (unless otherwise noted.)

8	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

THS5661A 12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

TYPICAL CHARACTERISTICS²

			SPURIOUS FREE DYNAMIC RANGE
								vs
			OUTPUT FREQUENCY AT 5 MSPS
	90
										DVDD =	3.3 V
	84
			0 dBFS
dBc±	78				± 6 dBFS
SFDR
	72
			± 12 dBFS
	66
	60
	0		0.5		1.0			1.5		2.0		2.5

Fout ± Output Frequency ± MHz

Figure 9

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 50 MSPS

	78
					DVDD = 3.3 V
		0 dBFS
	72		± 6 dBFS
± dBc	66	± 12 dBFS
SFDR	60
	54
	48
	0	5	10	15	20	25
		Fout ± Output Frequency ± MHz

Figure 11

SFDR ± dBc

SFDR ± dBc

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 25 MSPS

90
										DVDD = 3.3 V
84
				0 dBFS
78
72
		± 12 dBFS
66												± 6	dBFS
60
0		2				4		6		8		10		12

Fout ± Output Frequency ± MHz

Figure 10

SPURIOUS FREE DYNAMIC RANGE vs

OUTPUT FREQUENCY AT 70 MSPS

78

DVDD = 3.3 V

72

± 6 dBFS

66

0 dBFS

60

± 12 dBFS

54

48

0	10	20	30	40
	Fout ± Output Frequency ± MHz

Figure 12

²AV DD = 5 V, IOUTFS = 20 mA, differential transformer coupled output, 50 Ω doubly terminated load, TA = 25°C (unless otherwise noted.)

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

9

THS5661A

12-BIT, 125 MSPS, CommsDAC

DIGITAL-TO-ANALOG CONVERTER

SLAS247 ± NOVEMBER 1999

TYPICAL CHARACTERISTICS²

SPURIOUS FREE DYNAMIC RANGE

					vs
			AOUT AT FOUT = FCLOCK/11
	78							DVDD = 5 V
		4.55 MHz @ 50 MSPS
	72
dBc	66
				6.36 MHz @ 70 MSPS
±
SFDR	60
			9.1 MHz @ 100 MSPS
	54
	48
	±27	±24	±21	±18	±15	±12	±9	±6	±3	0
					Aout ± dBFS

Figure 13

DUAL TONE SPURIOUS FREE DYNAMIC RANGE

					vs
			AOUT AT FOUT = FCLOCK/7
	78
								DVDD = 5 V
	72	0.675/0.725 MHz @ 5 MSPS
	3.38/3.63 MHz @ 25 MSPS
± dBc	66
SFDR	60
							13.5/14.5 MHz
	54						@ 100 MSPS
					6.75/7.25 MHz @ 50 MSPS
	48			9.67/10.43 MHz @ 70 MSPS
	±27	±24	±21	±18	±15	±12	±9	±6	±3	0
					Aout ± dBFS

Figure 15

SPURIOUS FREE DYNAMIC RANGE

					vs
			AOUT AT FOUT = FCLOCK/5
	78							DVDD = 5 V
	72					5 MHz @ 25 MSPS
	66
± dBc		10 MHz @ 50 MSPS
	60
SFDR	54
	48					14 MHz @ 70 MSPS
	42				20 MHz @ 100 MSPS
	±27	±24	±21	±18	±15	±12	±9	±6	±3	0

Aout ± dBFS

Figure 14

TOTAL HARMONIC DISTORTION vs

CLOCK FREQUENCY AT FOUT = 2 MHz

±66
					DVDD = 5 V
±72	2nd Harmonic
±dBc
±78
THD				3rd Harmonic
±84	4th Harmonic
±90
0	20	40	60	80	100	120
	Fclock ±Clock Frequency ± MSPS

Figure 16

²AV DD = 5 V, IOUTFS = 20 mA, differential transformer coupled output, 50 Ω doubly terminated load, TA = 25°C (unless otherwise noted.)

10	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265