Analog Devices AD815-EB, AD815AYS, AD815AY, AD815AVR, AD815AV Datasheet

a		High Output Current
		Differential Driver
		AD815

FEATURES

Flexible Configuration

Differential Input and Output Driver or Two Single-Ended Drivers

High Output Power

Power Package

26 dBm Differential Line Drive for ADSL Application 40 V p-p Differential Output Voltage, RL = 50 V 500 mA Minimum Output Drive/Amp, RL = 5 V

Thermally Enhanced SOIC

400 mA Minimum Output Drive/Amp, RL = 10 V

Low Distortion

–66 dB @ 1 MHz THD, RL = 200 V, VOUT = 40 V p-p 0.05% and 0.458 Differential Gain and Phase, RL = 25 V

(6 Back-Terminated Video Loads) High Speed

120 MHz Bandwidth (–3 dB)

900 V/ms Differential Slew Rate

70 ns Settling Time to 0.1% Thermal Shutdown

APPLICATIONS

ADSL, HDSL and VDSL Line Interface Driver Coil or Transformer Driver

CRT Convergence and Astigmatism Adjustment Video Distribution Amp

Twisted Pair Cable Driver

PRODUCT DESCRIPTION

The AD815 consists of two high speed amplifiers capable of supplying a minimum of 500 mA. They are typically configured as a differential driver enabling an output signal of 40 V p-p on

± 15 V supplies. This can be increased further with the use of a

	–40
dBc		VS = 615V
	–50	G = +10
		VOUT = 40V p-p
–
DISTORTION	–60
	–70
HARMONIC	–80	RL = 50V
		(DIFFERENTIAL)
	–90			RL = 200V
				(DIFFERENTIAL)
TOTAL
	–100
	–110		10k	100k	1M
	100	1k				10M
			FREQUENCY – Hz

Total Harmonic Distortion vs. Frequency

REV. B

FUNCTIONAL BLOCK DIAGRAM

15-Lead Through-Hole SIP (Y) and Surface-Mount

	DDPAK(VR)
		15	NC
		14	NC
TAB IS		13	NC
		12	NC
+VS
		11	+IN2
		10	–IN2
		9	OUT2
	AD815	8	+VS
		7	–VS
		6	OUT1
		5	–IN1
		4	+IN1

3					NC
2					NC
1					NC

NC = NO CONNECT

REFER TO PAGE 3 FOR 24-LEAD SOIC PACKAGE

coupling transformer with a greater than 1:1 turns ratio. The low harmonic distortion of –66 dB @ 1 MHz into 200 Ω combined with the wide bandwidth and high current drive make the differential driver ideal for communication applications such as subscriber line interfaces for ADSL, HDSL and VDSL.

The AD815 differential slew rate of 900 V/µs and high load drive are suitable for fast dynamic control of coils or transformers, and the video performance of 0.05% and 0.45° differential gain and phase into a load of 25 Ω enable up to 12 back-terminated loads to be driven.

Three package styles are available, and all work over the industrial temperature range (–40°C to +85°C). Maximum output power is achieved with the power package available for through-hole mounting (Y) and surface-mounting (VR). The 24-lead SOIC (RB) is capable of driving 26 dBm for full rate ADSL with proper heat sinking.

				+15V
			100V	1/2
				AD815	R1	= 15V
				AMP1
				499V
V	IN	=			V =	RL	V =
			110V	G = +10	D
4Vp-p					40Vp-p	120V	OUT
							40Vp-p
				AMP2	R2 = 15V
			100V			1:2
						TRANSFORMER
				–15V

Subscriber Line Differential Driver

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: [phone]	World Wide Web Site: http://www.analog.com
Fax: [phone]	© Analog Devices, Inc., 1999

AD815–SPECIFICATIONS (@ TA = +258C, VS = 615 V dc, RFB = 1 kV and RLOAD = 100 V unless otherwise noted)

				AD815A
Model	Conditions	VS	Min	Typ	Max	Units
DYNAMIC PERFORMANCE		±15
Small Signal Bandwidth (–3 dB)	G = +1		100	120		MHz
	G = +1	±5	90	110		MHz
Bandwidth (0.1 dB)	G = +2	±15		40		MHz
	G = +2	±5		10		MHz
Differential Slew Rate	VOUT = 20 V p-p, G = +2	±15	800	900		V/µs
Settling Time to 0.1%	10 V Step, G = +2	±15		70		ns
NOISE/HARMONIC PERFORMANCE	f = 1 MHz, RLOAD = 200 Ω, VOUT = 40 V p-p	±15		–66		dBc
Total Harmonic Distortion
Input Voltage Noise	f = 10 kHz, G = +2 (Single Ended)	±5, ±15		1.85		nV/√Hz
Input Current Noise (+IIN)	f = 10 kHz, G = +2	±5, ±15		1.8		pA/√Hz
Input Current Noise (–IIN)	f = 10 kHz, G = +2	±5, ±15		19		pA/√Hz
Differential Gain Error	NTSC, G = +2, RLOAD = 25 Ω	±15		0.05		%
Differential Phase Error	NTSC, G = +2, RLOAD = 25 Ω	±15		0.45		Degrees
DC PERFORMANCE		±5
Input Offset Voltage				5	8	mV
	TMIN – TMAX	±15		10	15	mV
					30	mV
Input Offset Voltage Drift		±5		20		µV/°C
Differential Offset Voltage				0.5	2	mV
		±15		0.5	4	mV
	TMIN – TMAX				5	mV
Differential Offset Voltage Drift				10		µV/°C
–Input Bias Current		±5, ±15		10	90	µA
	TMIN – TMAX	±5, ±15			150	µA
+Input Bias Current				2	5	µA
	TMIN – TMAX	±5, ±15			5	µA
Differential Input Bias Current				10	75	µA
	TMIN – TMAX	±5, ±15			100	µA
Open-Loop Transresistance			1.0	5.0		MΩ
	TMIN – TMAX		0.5			MΩ
INPUT CHARACTERISTICS		±15				MΩ
Differential Input Resistance	+Input			7
	–Input	±15		15		Ω
Differential Input Capacitance				1.4		pF
Input Common-Mode Voltage Range		±15		13.5		±V
		±5		3.5		±V
Common-Mode Rejection Ratio	TMIN – TMAX	±5, ±15	57	65		dB
Differential Common-Mode Rejection Ratio	TMIN – TMAX	±5, ±15	80	100		dB
OUTPUT CHARACTERISTICS	Single Ended, RLOAD = 25 Ω	±15				±V
Voltage Swing			11.0	11.7
		±5	1.1	1.8		±V
	Differential, RLOAD = 50 Ω	±15	21	23		±V
Output Current1, 2	TMIN – TMAX	±15	22.5	24.5		±V
	RLOAD = 5 Ω	±15
VR, Y			500	750		mA
		±5	350	400		mA
RB-24	RLOAD = 10 Ω	±15	400	500		mA
Short Circuit Current		±15		1.0		A
Output Resistance		±15		13		Ω
MATCHING CHARACTERISTICS		±15
Crosstalk	f = 1 MHz			–65		dB
POWER SUPPLY					±18
Operating Range3	TMIN – TMAX	±5				V
Quiescent Current				23	30	mA
		±15		30	40	mA
	TMIN – TMAX	±5			40	mA
		±15			55	mA
Power Supply Rejection Ratio	TMIN – TMAX	±5, ±15	–55	–66		dB

NOTES

1Output current is limited in the 24-lead SOIC package to the maximum power dissipation. See absolute maximum ratings and derating curves. 2See Figure 12 for bandwidth, gain, output drive recommended operation range.

3Observe derating curves for maximum junction temperature. Specifications subject to change without notice.

–2–

REV. B

AD815

ABSOLUTE MAXIMUM RATINGS1		±18 V Total
Supply Voltage . . . . . . . .	. . . . . . . . . . . . . . . .
Internal Power Dissipation2
Plastic (Y and VR) . .	3.05 Watts (Observe Derating Curves)
Small Outline (RB) . .	2.4 Watts (Observe Derating Curves)
Input Voltage (Common Mode) . . . . . . . . . .		. . . . . . . . . . ±VS
Differential Input Voltage . . . . . . . . . . . . . . .		. . . . . . . . . ±6 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . .	. . . . Observe Power Derating Curves
	Can Only Short to Ground
Storage Temperature Range		–65°C to +125°C
Y, VR and RB Package	. . . . . . . . . . . . . . .
Operating Temperature Range		–40°C to +85°C
AD815A . . . . . . . . . . .	. . . . . . . . . . . . . . . .
Lead Temperature Range (Soldering, 10 sec)		. . . . . . . +300°C

NOTES

1Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

2Specification is for device in free air with 0 ft/min air flow: 15-Lead Through-Hole and Surface Mount: θJA = 41°C/W; 24-Lead Surface Mount: θJA = 52°C/W.

PIN CONFIGURATION

24-Lead Thermally-Enhanced SOIC (RB-24)

NC	1	24	NC
NC	2	23	NC
NC	3	22	NC
NC	4	21 NC

		5	AD815	20
	THERMAL	6		19	THERMAL
			TOP VIEW
	HEAT TABS				HEAT TABS
		7	(Not to Scale)	18
	+VS*				+VS*
		8		17
	+IN1	9		16	+IN2
	–IN1	10		15	–IN2
	OUT1	11		14	OUT2
	–VS	12		13	+VS

NC = NO CONNECT

*HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the AD815 is limited by the associated rise in junction temperature. The maximum safe junction temperature for the plastic encapsulated parts is determined by the glass transition temperature of the plastic, about 150°C. Exceeding this limit temporarily may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175°C for an extended period can result in device failure.

The AD815 has thermal shutdown protection, which guarantees that the maximum junction temperature of the die remains below a safe level, even when the output is shorted to ground. Shorting the output to either power supply will result in device failure. To ensure proper operation, it is important to observe the derating curves and refer to the section on power considerations.

It must also be noted that in high (noninverting) gain configurations (with low values of gain resistor), a high level of input overdrive can result in a large input error current, which may result in a significant power dissipation in the input stage. This power must be included when computing the junction temperature rise due to total internal power.

	14
																	TJ = 1508C
	13
Watts	12
												θJA = 168C/W
–	11											SOLDERED DOWN TO
DISSIPATION	7											COPPER HEAT SINK
	10											(STILL AIR = 0FT/MIN)
	9														AD815 AVR, AY
	8
POWER						θJA	= 418C/W
	6				(STILL AIR = 0FT/MIN)
	5				NO HEAT SINK
MAXIMUM	4													AD815 AVR, AY
	3
	2		θJA = 528C/W
			(STILL AIR = 0 FT/MIN)
	1												AD815ARB-24
			NO HEAT SINK
	0
	–50–40–30 –20 –100										10		20		30	40	50		60			70		80 90

AMBIENT TEMPERATURE –8C

Plot of Maximum Power Dissipation vs. Temperature

ORDERING GUIDE

Model	Temperature Range	Package Description	Package Option
AD815ARB-24	–40°C to +85°C	24-Lead Thermally Enhanced SOIC	RB-24
AD815ARB-24-REEL	–40°C to +85°C	24-Lead Thermally Enhanced SOIC	RB-24
AD815AVR	–40°C to +85°C	15-Lead Surface Mount DDPAK	VR-15
AD815AY	–40°C to +85°C	15-Lead Through-Hole SIP with Staggered Leads and 90° Lead Form	Y-15
AD815AYS	–40°C to +85°C	15-Lead Through-Hole SIP with Staggered Leads and Straight Lead Form	YS-15
AD815-EB		Evaluation Board

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD815 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

REV. B

–3–

AD815–Typical Performance Characteristics

	20
–6Volts
RANGE	15
VOLTAGE	10
COMMON-MODE	5
	0

0

5

10

15

20

SUPPLY VOLTAGE –6Volts

Figure 1. Input Common-Mode Voltage Range vs. Supply

Voltage
	40				80
p-p						p-p
– V						– V
VOLTAGE	30				60	VOLTAGE
			NO LOAD
OUTPUT	20			RL = 50V	40	OUTPUT
				(DIFFERENTIAL)
				RL = 25V
SINGLE-ENDED						DIFFERENTIAL
				(SINGLE-ENDED)
	10				20
	0				0
	0	5	10	15	20

SUPPLY VOLTAGE –6Volts

Figure 2. Output Voltage Swing vs. Supply Voltage

p-p	30			60	p-p
				VS = 615V
Volts	25			50	Volts
–					–
VOLTAGE	20			40	VOLTAGE
OUTPUT	15			30	OUTPUT
	10			20
SINGLE-ENDED					DIFFERENTIAL
				VS = 65V
	5			10
	0			0
	10	100	1k	10k
	LOAD RESISTANCE – (Differential –V) (Single-Ended –V/2)

Figure 3. Output Voltage Swing vs. Load Resistance

	36
	34						VS = 615V
– mA	32
	30
CURRENT	28
	26
SUPPLY							VS = 65V
	24
	22
	20
	18
	–40	–20	0	20	40	60	80	100
			JUNCTION TEMPERATURE –8C

Figure 4. Total Supply Current vs. Temperature

	33
mA	30		TA = +258C
–
CURRENT	27
TOTAL SUPPLY	24
	21
	18
	0	2	4	6	8	10	12	14	16

SUPPLY VOLTAGE –6Volts

Figure 5. Total Supply Current vs. Supply Voltage

	10					SIDE A, B
	0							+IB
						VS = 615V, 65V
–mA	–10
	–20
CURRENT
	–30						VS = 65V
							SIDE B
	–40							–I
BIAS								B
							SIDE A
	–50
INPUT
	–60						SIDE B
						SIDE A
								–I
	–70							B
	–80						VS = 615V
		–20	0	20	40	60	80	100
	–40
			JUNCTION TEMPERATURE –8C

Figure 6. Input Bias Current vs. Temperature

–4–

REV. B

AD815

0

80

TA = 258C

mV

–2

60

VS =

615V

VOLTAGEOFFSET–

40

–4

mV–OFFSETRTI

f = 0.1Hz 100V AD815

V

VS = 65V

VS

=

–6

20

610V

VS =

–8

0

65V

V I N

1/2

INPUT

–10

VS = 615V

–20

49.9V

OUT

RL=

–12

–40

1kV

1kV

5V

–14

–60

0

–40

–20

0

20

40

60

80

100

–2.0 –1.6

–1.2 –0.8

–0.4

0.4

0.8

1.2

1.6

2.0

JUNCTION TEMPERATURE –8C

LOAD CURRENT – Amps

Figure 7. Input Offset Voltage vs. Temperature

	750
								VS = 615V
– mA	700
			SOURCE
CURRENT	650
	600
CIRCUIT
			SINK
	550
SHORT
	500
	450
	–60	–40	–20	0	20	40	60	80	100	120	140
			JUNCTION TEMPERATURE –8C

Figure 8. Short Circuit Current vs. Temperature

	15
	10	TA = 258C					VS = 610V
		RL = 25V
					VS = 65V
									VS = 615V
mV	5
–
OFFSET	0
						V I N		1/2
RTI
	–5				f = 0.1Hz		100V	AD815		VOUT
							49.9V			RL=
	–10
							1kV	1kV		25V
	–15
	–20	–16	–12	–8	–4	0	4	8	12	16 20

VOUT – Volts

Figure 9. Gain Nonlinearity vs. Output Voltage

Figure 10. Thermal Nonlinearity vs. Output Current Drive

–V	100
RESISTANCE	10				VS = 65V
OUTPUT	1						VS = 615V
CLOSED-LOOP	0.1
	0.01
	30k	100k	300k	1M	3M	10M	30M	100M	300M

FREQUENCY – Hz

Figure 11. Closed-Loop Output Resistance vs. Frequency

p-p	40					TA = 258C
						VS = ±15V
V
–
VOLTAGE				RL = 100V
	30
OUTPUT				RL = 50V
	20
DIFFERENTIAL				RL = 25V
	10
				RL = 1V
	0
	0	2	4	6	8	10	12	14
				FREQUENCY – MHz

Figure 12. Large Signal Frequency Response

REV. B

–5–