ST TS616 User Manual

TS616

Dual wide band operational amplifier with high output current

Features

■Low noise: 2.5 nV/√Hz

■High output current: 420 mA

■Very low harmonic and intermodulation distortion

■High slew rate: 420 V/µs

■-3dB bandwidth: 40 MHz @ gain = 12 dB on 25 Ω single-ended load

■20.7 Vp-p differential output swing on 50 Ω load, 12 V power supply

■Current feedback structure

■5 V to 12 V power supply

■Specified for 20 Ω and 50 Ω differential load

Applications

■Line driver for xDSL

■Multiple video line driver

Description

DW

SO-8 Exposed-pad

(Plastic micropackage)

Pin connections (top view)

Output1	1			8	VCC +
Inverting Input1	2	-		7	Output2
Non Inverting Input1	3	+	-	6	Inverting Input2
VCC -	4		+	5	Non Inverting Input2
					dice
					Pad

Cross Section View Showing Exposed-Pad.

This pad must be connected to a (-Vcc) copper area on the PCB

The TS616 is a dual operational amplifier featuring a high output current of 410 mA. This driver can be configured differentially for driving signals in telecommunication systems using multiple carriers. The TS616 is ideally suited for xDSL (high speed asymmetrical digital subscriber line) applications. This circuit is capable of driving a 10 Ω or 25 Ω load on a range of power supplies:

±2.5 V, 5 V, ±6 V or +12 V. The TS616 is capable of reaching a -3 dB bandwidth of 40 MHz on 25 Ω load with a 12 dB gain. This device is designed for high slew rates and demonstrates low harmonic distortion and intermodulation.

September 2008

Rev 5

1/37

www.st.com

Contents	TS616

Contents

1	Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
2	Absolute maximum ratings and operating conditions . . . . . . . . . . . . .		4
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		5
4	Safe operating area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		16
5	Intermodulation distortion product . . . . . . . . . . . . . . . . . . . . . . . . . . . .		17
6	Printed circuit board layout considerations . . . . . . . . . . . . . . . . . . . . .		20
	6.1	Thermal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
7	Noise measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		23

7.1 Measurement of eN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.2 Measurement of iNn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.3 Measurement of iNp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8	Power supply bypassing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		26
	8.1	Single power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
	8.2	Channel separation and crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
9	Choosing the feedback circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		28
	9.1	The bias of an inverting amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
	9.2	Active filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
10	Increasing the line level using active impedance matching . . . . . . . .		31
11	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		34
12	Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		36
13	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		36

2/37

TS616	Typical application

1 Typical application

Figure 1 shows a schematic of a typical xDSL application using the TS616.

Figure 1. Differential line driver for xDSL applications

	3		8
		+	+Vcc	12.5Ω
		1/2TS6165
	2	_	1

Vi	R2	Vo
			1:2
	R1
	GND	25Ω	100Ω
	R4
Vi	R3	Vo
	4 _	12.5Ω
	1/2TS6165
	5 +
	4 -Vcc

3/37

Absolute maximum ratings and operating conditions	TS616

2 Absolute maximum ratings and operating conditions

	Table 1.	Absolute maximum ratings
	Symbol	Parameter	Value	Unit
	VCC	Supply voltage (1)	±7	V
	V	Differential input voltage (2)	±2	V
	id
	V	Input voltage range (3)	±6	V
	in
	Toper	Operating free air temperature range	-40 to + 85	°C
	Tstd	Storage temperature	-65 to +150	°C
	Tj	Maximum junction temperature	150	°C
	Rthjc	Thermal resistance junction to case	16	°C/W
	Rthja	Thermal resistance junction to ambient area	60	°C/W
	Pmax	Maximum power dissipation (at Tamb = 25° C) for	2	W
		Tj = 150° C
	ESD	HBM: human body model(4)	1.5	kV
	only pins	MM: machine model(5)	2	kV
	1, 4, 7, 8	CDM: charged device model(6)	200	V
	ESD	HBM: human body model(4)	1.5	kV
	only pins	MM: machine model(5)	2	kV
	2, 3, 5, 6	CDM: charged device model(6)	100	V
		Output short circuit	(7)

1.All voltage values, except differential voltage are with respect to network terminal.

2.Differential voltages are non-inverting input terminal with respect to the inverting input terminal.

3.The magnitude of input and output voltage must never exceed VCC +0.3 V.

4.Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.

5.Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins are floating.

6.Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.

7.An output current limitation protects the circuit from transient currents. Short-circuits can cause excessive heating. Destructive dissipation can result from short-circuits on amplifiers.

Table 2.	Operating conditions
Symbol	Parameter	Value	Unit
VCC	Power supply voltage	±2.5 to ±6	V
Vicm	Common mode input voltage	-VCC+1.5 V to +VCC-1.5 V	V

4/37

TS616							Electrical characteristics
3	Electrical characteristics
Table 3.	VCC = ±6 V, Rfb= 910 Ω, Tamb = 25° C (unless otherwise specified)
Symbol	Parameter			Test conditions			Min.	Typ.	Max.	Unit
DC performance
Vio	Input offset voltage	Tamb						1	3.5	mV
		Tmin < Tamb < Tmax						1.6
Vio	Differential input offset voltage	Tamb = 25°C							2.5	mV
Iib+	Positive input bias current	Tamb						5	30	µA
		Tmin < Tamb < Tmax						7.2
Iib-	Negative input bias current	Tamb						3	15	µA
		Tmin < Tamb < Tmax						3.1
ZIN+	Input(+) impedance							82		kΩ
ZIN-	Input(-) impedance							54		Ω
CIN+	Input(+) capacitance							1		pF
CMR	Common mode rejection ratio	Vic = ±4.5V					58	64		dB
	20 log ( Vic/ Vio)	T	min	< T	< T	max		62
				amb
SVR	Supply voltage rejection ratio	VCC = ±2.5V to ±6V					72	81		dB
	20 log ( VCC/ Vio)	T	min	< T	< T	max		80
				amb
ICC	Total supply current per operator	No load						13.5	17	mA
Dynamic performance and output characteristics
ROL	Open loop transimpedance	Vout = 7Vp-p, RL = 25Ω					5	13.5		MΩ
		Tmin < Tamb < Tmax						5.7
	-3dB bandwidth	Small signal Vout < 20mVp					25	40
		AV = 12dB, RL = 25Ω								MHz
BW	Full power bandwidth	Large signal Vout = 3Vp						26
		AV = 12dB, RL = 25Ω
	Gain flatness @ 0.1dB	Small signal Tamb<20mVp						7		MHz
		AV = 12dB, RL = 25Ω
Tr	Rise time	Vout = 6Vp-p, AV = 12dB, RL = 25Ω						10.6		ns
Tf	Fall time	Vout = 6Vp-p, AV = 12dB, RL = 25Ω						12.2		ns
Ts	Settling time	Vout = 6Vp-p, AV= 12dB, RL = 25Ω						50		ns
SR	Slew rate	Vout = 6Vp-p, AV = 12dB, RL = 25Ω					330	420		V/µs
VOH	High level output voltage	RL = 25Ω connected to GND					4.8	5.05		V
VOL	Low level output voltage	RL = 25Ω Connected to GND						-5.3	-5.1	V

5/37

Electrical characteristics						TS616
Table 3.	VCC = ±6 V, Rfb= 910 Ω, Tamb = 25° C (unless otherwise specified) (continued)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
	Output sink current	Vout = -4Vp	-320	-490
Iout		Tmin < Tamb < Tmax		-395		mA
	Output source current	Vout = +4Vp	330	420
		Tmin < Tamb < Tmax		370
Noise and distortion
eN	Equivalent input noise voltage	F = 100kHz		2.5		nV/√Hz
iNp	Equivalent input noise current (+)	F = 100kHz		15		pA/√Hz
iNn	Equivalent input noise current (-)	F = 100kHz		21		pA/√Hz
HD2	2nd harmonic distortion	Vout = 14Vp-p, AV = 12dB		-87		dBc
	(differential configuration)	F= 110kHz, RL = 50Ω diff.
HD3	3rd harmonic distortion	Vout = 14Vp-p, AV = 12dB		-83		dBc
	(differential configuration)	F= 110kHz, RL = 50Ω diff.
		F1= 100kHz, F2 = 110kHz
		Vout = 16Vp-p, AV = 12dB		-76
IM2	2nd order intermodulation product	RL = 50Ω diff.				dBc
	(differential configuration)	F1= 370kHz, F2 = 400kHz
		Vout = 16Vp-p, AV = 12dB		-75
		RL = 50Ω diff.
		F1 = 100kHz, F2 = 110kHz
		Vout = 16Vp-p, AV = 12dB		-88
IM3	3rd order intermodulation product	RL = 50Ω diff.				dBc
	(differential configuration)	F1 = 370kHz, F2 = 400kHz
		Vout = 16Vp-p, AV = 12 B		-87
		RL = 50Ω diff.

6/37

TS616						Electrical characteristics
Table 4.	VCC = ±2.5 V, Rfb= 910 Ω, Tamb = 25° C (unless otherwise specified)
Symbol	Parameter			Test conditions		Min.	Typ.	Max.	Unit
DC performance
Vio	Input offset voltage	Tamb					0.2	2.5	mV
		Tmin < Tamb < Tmax					1
Vio	Differential input offset voltage	Tamb = 25°C						2.5	mV
Iib+	Positive input bias current	Tamb					4	30	µA
		Tmin < Tamb < Tmax					7
Iib-	Negative input bias current	Tamb					1.1	11	µA
		Tmin < Tamb < Tmax					1.2
ZIN+	Input(+) impedance						71		kΩ
ZIN-	Input(-) impedance						62		Ω
CIN+	Input(+) capacitance						1.5		pF
CMR	Common mode rejection ratio	Vic = ±1V				55	61		dB
	20 log ( Vic/ Vio)	T	min	< T	< T		60
				amb	max
SVR	Supply voltage rejection ratio	VCC= ±2V to ±2.5V				63	79		dB
	20 log ( Vcc/ Vio)	T	min	< T	< T		78
				amb	max
ICC	Total supply current per	No load					11.5	15	mA
	operator
Dynamic performance and output characteristics
ROL	Open loop transimpedance	Vout = 2Vp-p, RL = 10Ω				2	4.2		MΩ
		Tmin < Tamb < Tmax					1.5
	-3dB bandwidth	Small signal Vout < 20mVp				20	28
		AV = 12dB, RL = 10Ω							MHz
BW	Full power bandwidth	Large signal Vout = 1.4Vp AV= 12dB,					20
		RL = 10Ω
	Gain flatness @ 0.1dB	Small signal Vout< 20mVp					5.7		MHz
		AV = 12dB, RL = 10Ω
Tr	Rise time	Vout = 2.8Vp-p, AV = 12dB RL= 10Ω					11		ns
Tf	Fall time	Vout = 2.8Vp-p, AV = 12dB RL= 10Ω					11.5		ns
Ts	Settling time	Vout = 2.2Vp-p, AV = 12dB RL= 10Ω					39		ns
SR	Slew rate	Vout = 2.2Vp-p, AV = 12dB RL =10Ω				100	130		V/µs
VOH	High level output voltage	RL=10Ω connected to GND				1.5	1.7		V
VOL	Low level output voltage	RL=10Ω connected to GND					-1.9	-1.7	V
	Output sink current	Vout = -1.25Vp				-300	-400
Iout		Tmin < Tamb < Tmax					-360		mA
	Output source current	Vout = +1.25Vp				200	270
		Tmin < Tamb < Tmax					240

7/37

Electrical characteristics						TS616
Table 4.	VCC = ±2.5 V, Rfb= 910 Ω, Tamb = 25° C (unless otherwise specified) (continued)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
Noise and distorsion
eN	Equivalent input noise voltage	F = 100kHz		2.5		nV/√Hz
iNp	Equivalent input noise current	F = 100kHz		15		pA/√Hz
	(+)
iNn	Equivalent input noise current	F = 100kHz		21		pA/√Hz
	(-)
HD2	2nd harmonic distortion	Vout = 6Vp-p, AV = 12 dB		-97		dBc
	(differential configuration)	F= 110kHz, RL = 20 Ω diff.
HD3	3rd harmonic distortion	Vout = 6Vp-p, AV = 12dB		-98		dBc
	(differential configuration)	F= 110 kHz, RL = 20Ω diff.
		F1= 100 kHz, F2 = 110 kHz
	2nd order intermodulation	Vout = 6 Vp-p, AV = 12dB		-86
		RL = 20Ω diff.
IM2	product					dBc
		F1= 370kHz, F2 = 400kHz
	(differential configuration)
		Vout = 6Vp-p, AV = 12dB		-88
		RL = 20Ω diff.
		F1 = 100kHz, F2 = 110kHz
	3rd order intermodulation	Vout = 6Vp-p, AV = 12dB		-90
		RL = 20Ω diff.
IM3	product					dBc
		F1 = 370kHz, F2 = 400kHz
	(differential configuration)
		Vout = 6Vp-p, AV = 12dB		-85
		RL = 20Ω diff.

8/37

TS616						Electrical characteristics
Figure 2.	Load configuration			Figure 3.	Load configuration
RL= 25Ω				RL= 25 Ω
VCC= ±6 V				VCC= ±.5V
+	+6V		50Ω	+	+2.5V		50Ω
		49.9Ω	cable		10Ω	49.9Ω	cable
TS616
		25Ω		TS616
_				_
		33Ω	50Ω			11Ω	50Ω
	-6V				-2.5V
		1W				0.5W

Figure 4. Closed loop gain vs. frequency									Figure 5. Closed loop gain vs. frequency
AV=+1, VCC=±2.5V, Rfb=1.1kΩ,					RL= 10Ω				AV=-1, VCC= ±2.5V, Rfb=1kΩ,					Rin=1kΩ, RL= 10Ω
	2	VCC=±6V, Rfb=750Ω,			RL= 25Ω		40			VCC=±6V, Rfb=680Ω,			Rin=680Ω,		RL= 25Ω
			gain			(Vcc=±6V)				2						-140
												gain
	0									0
							20									-160
														(Vcc=±2.5V)
	-2		phase		(Vcc=±2.5V)					-2		phase
							0								(Vcc=±6V)	-180
(gain (dB)	-4						-20		(gain (dB))	-4
	-6							Phase (°)		-6				(Vcc=±2.5V)		-200
				(Vcc=±2.5V)
	-8						-40			-8						-220
					(Vcc=±6V)									(Vcc=±6V)		Phase°)(
	-10						-60			-10
																-240
	-12						-80			-12						-260
	-14						-100			-14						-280
	-16						-120			-16
	100	1k	10k	100k	1M	10M				100	1k	10k	100k	1M	10M	-300
							100M									100M
			Frequency (Hz)									Frequency (Hz)

Figure 6. Closed loop gain vs. frequency									Figure 7. Closed loop gain vs. frequency
AV=+2, VCC=±2.5V, Rfb=1kΩ,					RL= 10Ω				AV=-2, VCC=±2.5V, Rfb=1kΩ,					Rin=510Ω,	RL=10Ω
	8	VCC=±6V, Rfb=680Ω,			RL= 25Ω		40		VCC=±6V, Rfb=680Ω,				Rin=750/620Ω,		RL= 25Ω
						(Vcc=±6V)				8						-140
			gain									gain
	6									6
							20									-160
														(Vcc=±2.5V)
	4		phase		(Vcc=±2.5V)					4		phase
							0							(Vcc=±6V)		-180
(gain (dB))	2								(gain (dB))	2
	0			(Vcc=±2.5V)			-20			0				(Vcc=±2.5V)		-200
	-2						-40			-2						-220
					(Vcc=±6V)			Phase°)(						(Vcc=±6V)		Phase°)(
	-4						-60			-4
																-240
	-6						-80			-6						-260
	-8						-100			-8						-280
	-10						-120			-10						-300
	100	1k	10k	100k	1M	10M				100	1k	10k	100k	1M	10M
							100M									100M
			Frequency (Hz)									Frequency (Hz)
																9/37

Electrical characteristics	TS616
Figure 8. Closed loop gain vs. frequency	Figure 9. Closed loop gain vs. frequency

AV=+4, VCC=±2.5V, Rfb=910Ω,					Rg=300Ω, RL=10Ω				AV=-4, VCC=±2.5V, Rfb=1kΩ Rin=320/360Ω RL=10Ω
	VCC=±6V, Rfb=620Ω, Rg=560/330Ω, RL= 25Ω									VCC=±6V, Rfb=620Ω,			Rin=360/270Ω,		RL= 25Ω
	14						40			14						-140
	12		gain							12		gain
							20									-160
					(Vcc=±2.5V)									(Vcc=±2.5V)
	10		phase							10		phase
						(Vcc=±6V)	0							(Vcc=±6V)		-180
(gain (dB))	8								(gain (dB))	8
	6				(Vcc=±2.5V)		-20			6				(Vcc=±2.5V)		-200
	4						-40			4						-220
					(Vcc=±6V)			Phase°)(						(Vcc=±6V)		Phase°)(
	2						-60			2
																-240
	0						-80			0						-260
	-2						-100			-2						-280
	-4						-120			-4						-300
	100	1k	10k	100k	1M	10M				100	1k	10k	100k	1M	10M
							100M									100M
			Frequency (Hz)									Frequency (Hz)

Figure 10. Closed loop gain vs. frequency									Figure 11. Closed loop gain vs. frequency
AV=+8, VCC=±2.5V, Rfb=680Ω, Rg=240/160Ω, RL=10Ω									AV=-8, VCC=±2.5V, Rfb=680Ω Rin=160/180Ω RL=10Ω
	VCC=±6V, Rfb=510Ω,			Rg=270/100Ω,		RL= 25Ω				VCC=±6V, Rfb=510Ω,			Rin=150/110Ω,		RL= 25Ω
	20						40			20						-140
	18		gain							18		gain
							20									-160
					(Vcc=±2.5V)									(Vcc=±2.5V)
	16		phase							16		phase
					(Vcc=±6V)		0							(Vcc=±6V)		-180
(gain (dB))	14						-20		(gain (dB))	14
	12				(Vcc=±2.5V)			Phase (°)		12				(Vcc=±2.5V)		-200
	10						-40			10						-220
					(Vcc=±6V)									(Vcc=±6V)		Phase°()
	8						-60			8
																-240
	6						-80			6						-260
	4						-100			4						-280
	2						-120			2						-300
	100	1k	10k	100k	1M	10M				100	1k	10k	100k	1M	10M
							100M									100M
			Frequency (Hz)									Frequency (Hz)
Figure 12. Positive slew rate									Figure 13. Positive slew rate
AV = +4, Rfb = 910Ω, VCC = ±6 , RL= 25Ω									AV = +4, Rfb = 910 Ω, VCC = ±2.5V, RL= 10Ω
	4									2
	2									1

(V)

0

(V)

0

OUT

OUT

V

V

-2

-1

-4

-2

0.0

10.0n

20.0n

30.0n

40.0n

50.0n

0.0

10.0n

20.0n

30.0n

40.0n

50.0n

Time (s)

Time (s)

10/37

TS616

Electrical characteristics

Figure 14. Positive slew rate

Figure 15. Positive slew rate

A

= -4, R

= 620 Ω, V

= ±6 V, R = 25 Ω

A

= -4, R

= 910 , V

CC

= ±2.5 V, R = 10

Ω

V

fb

CC

L

V

fb

Ω

L

4

2

2

1

(V)

0

(V)

0

OUT

OUT

V

V

-2

-1

-4

-2

0.0

10.0n

20.0n

30.0n

40.0n

50.0n

0.0

10.0n

20.0n

30.0n

40.0n

50.0n

Time (s)

Time (s)

Figure 16.

Negative slew rate

Figure 17.

Negative slew rate

AV = +4, Rfb = 620 Ω, VCC = ±6 V, RL= 25 Ω

	4
	2
(V)	0
OUT
V
	-2
	-4
	0.0	10.0n	20.0n	30.0n	40.0n	50.0n

Time (s)

AV =

OUT

V (V)

+4, Rfb = 910 Ω, VCC = ±2.5 V, RL= 10 Ω

2

1

0

-1

-2
0.0	10.0n	20.0n	30.0n	40.0n	50.0n

Time (s)

Figure 18. Negative slew rate

Figure 19. Negative slew rate

AV = +4, Rfb = 620 Ω, VCC = ±6 V, RL= 25 Ω

	4
	2
(V)	0
OUT
V
	-2
	-4
	0.0	10.0n	20.0n	30.0n	40.0n	50.0n

Time (s)

AV =

OUT

V (V)

+4, Rfb = 910 Ω, VCC = ±2.5 V, RL= 10 Ω

2

0

-2
0.0	10.0n	20.0n	30.0n	40.0n	50.0n

Time (s)

11/37

Electrical characteristics	TS616
Figure 20. Input voltage noise level	Figure 21. ICC vs. power supply
AV = +92, Rfb = 910 Ω	Open loop, no load
Input+ connected to GND via 25 Ω

	5.0									30
						+	+ 6V	Output
Hz)	4.5					_				20					Icc(+)
							- 6V
(nV/√	4.0					10Ω	910Ω			10
Noise									(mA)
	3.5									0
Voltage									I
									CC
	3.0									-10
Input	2.5									-20					Icc(-)
	2.0									-30
	100		1k		10k	100k			1M	0	1	2	3	4	5	6	7	8	9	10	11	12
				(Frequency (Hz)											VCC (V)
Figure 22. Iib vs. power supply									Figure 23. VOH & VOL vs. power supply
Open loop, no load									Open loop, RL = 25 Ω
	7									6
		Iib+								5		VOH
	6									4
		IB+
										3
	5								(V)	2
										1
	4								OL
μ(A)									&V	0
Iib	3								OH	-1		VOL
B									V
I										-2
		Iib-
	2
		I	-							-3
		B
										-4
	1									-5
	0									-6
										5		6	7		8		9	10		11		12
	5	6	7	8	9	10		11	12

V (V)	Vcc (V)
cc

Figure 24. Isource vs. output amplitude Figure 25. Isource vs. output amplitude

VCC = ±6 V, open loop, no load								VCC = ±2.5 V, open loop, no load
	700								700
	600								600
(mA)	500							(mA)	500
	400								400
Isource								Isource
	300								300
	200								200
	100								100
	0								0
	0	1	2	3	4	5	6		0.0	0.5	1.0	1.5	2.0	2.5
				Vout	(V)						Vout (V)
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